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Old 06-11-2018, 03:32 PM   #361
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Just wanted to correct a few numbers. The overall mileage of my truck is 19.9 mpg. Has right at 11,400 miles. Hadn't looked at that screen since we came home, towing the Airstream. Also, the best 400 mile range average I have is 25mpg, and the best 50 mile average is 27.3mpg. Hope this helps. Didn't want to mislead anyone. And it is a crew cab, 4wd, with the 5.5 ft bed. Mike
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Old 06-11-2018, 04:36 PM   #362
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Originally Posted by Mike S. View Post
Just wanted to correct a few numbers. The overall mileage of my truck is 19.9 mpg. Has right at 11,400 miles. Hadn't looked at that screen since we came home, towing the Airstream. Also, the best 400 mile range average I have is 25mpg, and the best 50 mile average is 27.3mpg. Hope this helps. Didn't want to mislead anyone. And it is a crew cab, 4wd, with the 5.5 ft bed. Mike
Mike. Are these numbers off the DIC or are they calculated actual mileage?
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Old 06-13-2018, 07:43 PM   #363
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All of the numbers are from the computer. Never think about writing things down when I get gas. It's got to be pretty close though.
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Old 10-01-2018, 07:13 AM   #364
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For those who may still be following this thread, I wanted to post a result.

We just returned from our second week long trip towing our 2018 27FB FCQ with our 2018 GMC Sierra SLT with 6.2 and Max Tow Package. The trip was from Fredericksburg Texas to the Airstream Factory in Jackson Center Ohio for warranty repairs. For our outbound route, we headed east thru Jackson Mississippi to Montgomery Alabama then north. We headed west from Jackson Center to Springfield Illinois, then southwest thru the Ozark's to Oklahoma City, south to Ft. Worth west to Hwy 16 then south. Quite a variety of roads, terrain and weather. We spent the nightsClick image for larger version

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I used the cruise control set at 65 MPH the entire trip and never drove the truck without the AS attached. My AS weighed in at 6280 lb. with a full tank of fresh water at departure. I put the highest octane gas available per state which varied from 93 down to 91.

My MPG results off the computer in the dash for the entire trip was as follows....

Total 3190 mile MPG average 12.3
Outbound 1674 mile MPG average was 12.3
Return 1516 mile MPG average was 12.2

The best 25 mile MPG average was 15.9
The best 50 mile MPG average was 14.9
The best 400 mile MPG average was 13.1
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Old 10-01-2018, 07:46 AM   #365
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Originally Posted by twbucksr View Post
For those who may still be following this thread, I wanted to post a result.

We just returned from our second week long trip towing our 2018 27FB FCQ with our 2018 GMC Sierra SLT with 6.2 and Max Tow Package. The trip was from Fredericksburg Texas to the Airstream Factory in Jackson Center Ohio for warranty repairs. For our outbound route, we headed east thru Jackson Mississippi to Montgomery Alabama then north. We headed west from Jackson Center to Springfield Illinois, then southwest thru the Ozark's to Oklahoma City, south to Ft. Worth west to Hwy 16 then south. Quite a variety of roads, terrain and weather. We spent the nightsAttachment 324158 in Walmart and Cracker Barrel parking lots as well as camp grounds.

I used the cruise control set at 65 MPH the entire trip and never drove the truck without the AS attached. My AS weighed in at 6280 lb. with a full tank of fresh water at departure. I put the highest octane gas available per state which varied from 93 down to 91.

My MPG results off the computer in the dash for the entire trip was as follows....

Total 3190 mile MPG average 12.3
Outbound 1674 mile MPG average was 12.3
Return 1516 mile MPG average was 12.2

The best 25 mile MPG average was 15.9
The best 50 mile MPG average was 14.9
The best 400 mile MPG average was 13.1


My 2015 Silverado 1500 6.2 liter Max Tow Pkg Crew Cab Short Box averaged 12.4 mpg over 28,000 miles pulling a 2015 FC 30. My new 2018 version of the same vehicle averaged 14.1 over the first 5000 miles of towing. Plenty of power in the Rockies and very stable and safe tow vehicle rated to tow over 11,000 pounds. The FC30 all loaded up is around 7,500 pounds.
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Old 10-02-2018, 06:40 AM   #366
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My mileage on my 2017 double cab with 6.5í bed is very similar. As I write this, we are towing our 2018 FC 30 from Vermont to the Balloon Fiesta Rally in Albuquerque. So far, we are in very windy Amarillo, Texas. Cumulative mileage so far is 12.2. The best tank was 14.8 and the worst was just 9.6, probably due to the wind and hills here in the Panhandle.
After touring the west, then to the Souteast and back to Vermont I will report back again. My guess is that we will have covered over 6000 miles by the time we are home in a month.
We love this truck and II donít feel the need for any changes!
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Old 10-02-2018, 08:18 PM   #367
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Originally Posted by sb55 View Post
My mileage on my 2017 double cab with 6.5í bed is very similar. As I write this, we are towing our 2018 FC 30 from Vermont to the Balloon Fiesta Rally in Albuquerque. So far, we are in very windy Amarillo, Texas. Cumulative mileage so far is 12.2. The best tank was 14.8 and the worst was just 9.6, probably due to the wind and hills here in the Panhandle.
After touring the west, then to the Souteast and back to Vermont I will report back again. My guess is that we will have covered over 6000 miles by the time we are home in a month.
We love this truck and II donít feel the need for any changes!
Although premium gas is required/recommended, these trucks are really great on mileage. I'm currently on a trip in New England (started in Wichita, KS and presently in Boston) and I've gotten a high of about 12.7 MPG towing with an average of about 11.8. Solo on this trip I've gotten over 22 MPG during multiple day trips.

My 2017 Crew Cab is towing our 1991 34" Limited weighing about 9,000 pounds. In eighteen months of ownership, I've had virtually no problems with the truck and it is a pleasure to drive...far more than my prior 3/4 ton Yukon XL which was good in it's own right.

Here we were at Lake Erie SP campground (great overnight stop)!Click image for larger version

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Old 10-04-2018, 05:13 PM   #368
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We have a 2018 Denali and tow our 23CB with ease. We are averaging 15.4 mpg with our truck. It has enough power and the cooling system is great. No problems in 100 plus outside temperatures going up 7% grades here in So Cal.
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Old 10-04-2018, 07:37 PM   #369
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Quote:
Originally Posted by Steve Bryant View Post
Although premium gas is required/recommended, these trucks are really great on mileage. I'm currently on a trip in New England (started in Wichita, KS and presently in Boston) and I've gotten a high of about 12.7 MPG towing with an average of about 11.8. Solo on this trip I've gotten over 22 MPG during multiple day trips.

My 2017 Crew Cab is towing our 1991 34" Limited weighing about 9,000 pounds. In eighteen months of ownership, I've had virtually no problems with the truck and it is a pleasure to drive...far more than my prior 3/4 ton Yukon XL which was good in it's own right.

Here we were at Lake Erie SP campground (great overnight stop)!Attachment 324322


Steve

Beautiful towing rig!

I love my 08 Tundra. It has towed my 66 Airstream Tradewind wonderfully without problems since new. Having said this your truck would be on my short list if I were shopping for another truck.

Dan
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Old 10-23-2018, 12:59 PM   #370
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Update from the OP
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Old 10-26-2018, 09:57 PM   #371
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Update from the OP


Hereís the text that got eaten:
Now 72,000 miles on the truck as we prepare for another X-country ride to SoCal. OEM tires just replaced, although the fronts were worn down to the cord about 4,000
miles ago. (Medical issues precluded any trips longer than 10 days for the past 18 months.)
Front brake pads and discs replaced.
Rear differential lube replaced.
Non-working driver side door lock actuator replaced.
Transmission fluid flash under powertrain warranty cured a driveline vibration that showed up intermittently at speeds above 45 mph once transmission and engine were warmed up. (NB: Thereís a GM TSB about this. It is NOT an alignment, shocks, suspension problem.)
Thatís it, plus oil changes as required, for the life of the truck so far.
Best 400 mile fuel consumption: 24.6 mpg. Running the recommended premium (from ďtop tierĒ supplier) but sneak in a little 89 octane when running with no load. Long-term continuous use of 89 octane lights up the CEL.
One ownerís experience.
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Old 10-27-2018, 03:36 AM   #372
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The "Chevy Shake"

I too had the "chevy shake" (slight vibration) in my 2015 Silverado 1500 6.2
truck at about 55 miles per hour. I too discovered that this is a known issue with some of these trucks. In my case, the transmission control computer software and torque converter was replaced under warranty which fixed the problem. I have since replaced the 2015 with a 2018 model, no shake with the new one.
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Old 11-13-2018, 05:12 PM   #373
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I've been watching this thread from time to time and really appreciate the information posted here. I almost "pulled the trigger" last year but decided to wait and see what the 2019's look like. In general, I like the exterior appearance of the 2019 better than the 2018 and earlier models but it's not enough to make me insist on the later model.

So, now the question for all you gearheads...

What are you thoughts on:

1) buying a 2018 - the last year for that body style, 8-speed transmission, etc.,

OR

2) buying the 2019 - the first year for that body style, 10-speed transmission, and the potential 2019 production start-up issues

In both cases I'd be buying the 6.2L

On a bit of side note... I noticed the 2019 doesn't seem to have special trailering mirrors included as part of the max trailering package.
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Old 11-13-2018, 05:54 PM   #374
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On a bit of side note... I noticed the 2019 doesn't seem to have special trailering mirrors included as part of the max trailering package.

As of right now a "Max Trailering" option isn't available. It's that option package that gets you the following:


Trailering mirrors (Option code DQS)
Larger and heavier rear-end (10.5in + 350lbs of cargo)
6.2L engine
3.73 rear-end (unless 3.42 was optionally selected).


I'm heavily contemplating trying to find a 2018 with the trailering package because the 2019 new body style has reduced the cargo capacity (GRAWR) by 150lbs 3950 to 3800lbs. Not to mention raising the price by like $15k.
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Old 11-14-2018, 11:43 AM   #375
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Quote:
Originally Posted by LuckyCloud View Post
As of right now a "Max Trailering" option isn't available. It's that option package that gets you the following:


Trailering mirrors (Option code DQS)
Larger and heavier rear-end (10.5in + 350lbs of cargo)
6.2L engine
3.73 rear-end (unless 3.42 was optionally selected).


I'm heavily contemplating trying to find a 2018 with the trailering package because the 2019 new body style has reduced the cargo capacity (GRAWR) by 150lbs 3950 to 3800lbs. Not to mention raising the price by like $15k.
Are you sure that package is just "not available" or is it that it is not available with the trim level you are looking at? I note that when I was looking, (before I purchased the Ford F250 6.7L diesel that is) GM told me you could not get the max tow package and mirrors with the fancy upgraded models like the Denali or LTZ at the time; but that was back in late 2017. I thought it odd, but payloads were lower also on the fancier models; just like Ford F150's upper level models...
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Old 11-14-2018, 12:35 PM   #376
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A Different Question...

I've hijacked DC Bruce's thread into a "should I buy this, should I buy that?" so I'll go ahead and go on another tangent related to the 2018 truck we're considering.

The truck has the features we want: 2018 Crew Cab 1500 Silverado, 4WD, short box, LTZ, 6.2L, Max Trailering Package. However, this particular vehicle was a demo (demonstrator) model for the owner of the dealership. It has just over 6,000 miles. Of course it's been serviced during that time and photographs indicate it's in very good condition. Unfortunately, it's a bit of a drive to go see the vehicle - it's sufficiently far away that I need to be certain that we want this truck.

Any comments on the demo aspect of this vehicle? If they make a price accommodation for the miles (and decreased warranty period) it doesn't seem unreasonable to buy a demo unit. We plan to keep the vehicle for quite some time. Most of our prior vehicles have about 200k miles before we decide to sell them.
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Old 11-14-2018, 01:08 PM   #377
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Quote:
Originally Posted by nvestysly View Post
I've hijacked DC Bruce's thread into a "should I buy this, should I buy that?" so I'll go ahead and go on another tangent related to the 2018 truck we're considering.

The truck has the features we want: 2018 Crew Cab 1500 Silverado, 4WD, short box, LTZ, 6.2L, Max Trailering Package. However, this particular vehicle was a demo (demonstrator) model for the owner of the dealership. It has just over 6,000 miles. Of course it's been serviced during that time and photographs indicate it's in very good condition. Unfortunately, it's a bit of a drive to go see the vehicle - it's sufficiently far away that I need to be certain that we want this truck.

Any comments on the demo aspect of this vehicle? If they make a price accommodation for the miles (and decreased warranty period) it doesn't seem unreasonable to buy a demo unit. We plan to keep the vehicle for quite some time. Most of our prior vehicles have about 200k miles before we decide to sell them.
Not sure if the system has changed but when I sold GM up till 08, buying a demo at the end if the year was a good thing as in Canada at least,the warranty was extended to cover the miles and time in service. Depending of course on when it was put into service. Usually they were very good buys and if this truck has the equipment you want which is easy to verify with the VIN then I wouldn't hesitate. As long as they make the price right, I would say go for it.


George
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Old 11-14-2018, 06:50 PM   #378
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Not sure if the system has changed but when I sold GM up till 08, buying a demo at the end if the year was a good thing as in Canada at least,the warranty was extended to cover the miles and time in service. Depending of course on when it was put into service. Usually they were very good buys and if this truck has the equipment you want which is easy to verify with the VIN then I wouldn't hesitate. As long as they make the price right, I would say go for it.


George


OP here:
Actually my truck was a so-called program vehicle which was 6 months old and had about 6k miles. I flew all the way from Washington DC to Denver to get the truck and then drove it back. At the time, you couldnít even order the max trailer tow package, which gives me 500 extra pounds of payload (1940), which I considered essential if we were going to use a 1/2 ton instead of a 3/4.
As to the question posed 2018 vs. 2019, there are two issues: Price and transmission. I canít imagine the need for any more gears, based on my experience. The 8-speed has been problematic: under low speed, light load conditions the TQ lockup can engage abruptly, giving a mild driveline shock. There have been multiple reflashes of the engine/transmission control unit (not at my request; apparently TSBs when I brought my truck in for routine service).
A few posts up I reported on odd transmission behavior I experienced that was the subject of a TSB. The fluid flush seems to have addressed the problem, but Iím left with concerns about long term durability of the transmission. So thereís that.
I take GMís abandonment of the 8-speed as a not good sign.
Check the duration of your powertrain warranty.
Happy trails!
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Old 11-14-2018, 07:16 PM   #379
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Quote:
Originally Posted by DC Bruce View Post
OP here:
Actually my truck was a so-called program vehicle which was 6 months old and had about 6k miles. I flew all the way from Washington DC to Denver to get the truck and then drove it back. At the time, you couldnít even order the max trailer tow package, which gives me 500 extra pounds of payload (1940), which I considered essential if we were going to use a 1/2 ton instead of a 3/4.
As to the question posed 2018 vs. 2019, there are two issues: Price and transmission. I canít imagine the need for any more gears, based on my experience. The 8-speed has been problematic: under low speed, light load conditions the TQ lockup can engage abruptly, giving a mild driveline shock. There have been multiple reflashes of the engine/transmission control unit (not at my request; apparently TSBs when I brought my truck in for routine service).
A few posts up I reported on odd transmission behavior I experienced that was the subject of a TSB. The fluid flush seems to have addressed the problem, but Iím left with concerns about long term durability of the transmission. So thereís that.
I take GMís abandonment of the 8-speed as a not good sign.
Check the duration of your powertrain warranty.
Happy trails!
GM continues to use the 8spd with the 5.3L.
Not to nitpick but program vehicles usually came to us from GM and we never knew how and where they were used but the Demos were driven by sales or managerial staff and were owned by our dealership.
I'm still driving my 08 6L with 4sp auto and have no experience with the 6 8 or 10spd transmissions.
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Old 11-15-2018, 09:02 AM   #380
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Quote:
Originally Posted by nvestysly View Post
I've hijacked DC Bruce's thread into a "should I buy this, should I buy that?" so I'll go ahead and go on another tangent related to the 2018 truck we're considering.

The truck has the features we want: 2018 Crew Cab 1500 Silverado, 4WD, short box, LTZ, 6.2L, Max Trailering Package. However, this particular vehicle was a demo (demonstrator) model for the owner of the dealership. It has just over 6,000 miles. Of course it's been serviced during that time and photographs indicate it's in very good condition. Unfortunately, it's a bit of a drive to go see the vehicle - it's sufficiently far away that I need to be certain that we want this truck.

Any comments on the demo aspect of this vehicle? If they make a price accommodation for the miles (and decreased warranty period) it doesn't seem unreasonable to buy a demo unit. We plan to keep the vehicle for quite some time. Most of our prior vehicles have about 200k miles before we decide to sell them.
I would not be concerned about the "demo" with 6K miles...what is the payload...if you get a decent payload on that and a good price, go for it!
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