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Old 07-07-2015, 06:22 AM   #15
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Silverflames, we have an F350 6.7 Diesel Crew Cab, SRW, with 6.6 Bed. We get 13.8 MPG towing a 30' FC. Not towing around the hills of Western PA we attain 12.9MPG. On the interstates, going speed limits and not towing we get 21.2MPG. Obviously all are averages and when towing the truck is fully loaded, around town usually only me and my Labrador and when on interstates my wife, dog and me with luggage.

DEF usage is about one gallon every 1,000 - 1,500 miles, does not seem to matter towing or not. When on trips we carry a large container and of course it can be purchased now at almost any auto parts store and all truck stops.
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Old 07-07-2015, 07:38 AM   #16
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Wow! 21 mpg hwy driving that's great!
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Old 07-07-2015, 08:17 AM   #17
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We have a 2015 F-250 diesel, crew cab, long bed, platinum edition and get about 12 mpg towing our 2014 27' FB on the highway at 60 to 65 mph, when not towing we get 14 mpg "around town" and 16 mpg on the highway at 70. We will occasionally do better than these numbers if the wind is at our back (it does make a difference!) These figures are entirely based on the readout on the in-dash computer. I've not done any tests by filling up the tank and noting the mpg's at the next fill up.

I am always amazed at people who report getting significantly better mileage than we do. I wonder if we may have a rear end that is geared for torque vs. optimum mileage?

In any event, the 3/4 ton Ford diesel setup is a dream tow vehicle (I'm sure the same can be said of the GM & Chrysler counterparts.) We have plenty of power, have no sense that the trailer is pushing us around, and we have plenty of cargo space. I can't imagine that a 1 ton would add to the experience unless you want to carry a motorcycle or rock collection in the bed. We got the long bed to accommodate four bicycles plus a modest amount of cargo in the bed under our cap. A side benefit of the longer wheelbase is a better towing experience than a short bed. But, if we didn't need to carry four bicycles, I would have gotten the short bed for maneuverability while unhitched and I'm sure I would have been pleased with it's towing capability as well.

The larger gas tank that comes with the long bed is nice. If we had the short bed with the 26 gallon tank I would definitely spring for the 50 gallon aftermarket tank. As it is, the 39 gallon tank is fine and lets me fill up when unhitched 99% of the time.

The added ongoing maintenance cost difference between gas and diesel is a non-issue. Oil changes cost about $110 vs. $30 to $40 with a gasser and DEF costs about $15-20 per 5,000 miles of driving. On a per mile basis, the difference doesn't even make it to the status of a "rounding error."

I have towed my trailer with a nearly identical F-250 gas model and it performed competently. The gas engine/tranny needed to downshift and rev quite a bit higher than the diesel to get up hills but I never had the sense that it wasn't going to make it. Mileage with the gas model was about 25% to 30% less across the board than with the diesel.

The pure cost benefit of diesel vs. gas depends to a great extent on how many miles you drive per year and how long you will end up keeping the truck so this is a very personalized analysis that no "rule of thumb" can cover. In the final analysis I suspect that over the entire life cycle of truck ownership, the cost of gas vs. diesel ends up pretty much a wash and, if there is a cost advantage, it's likely small and points towards with the gasser unless you drive a lot which might tip the scales to the diesel. It's one of those pay-me-now vs. pay-me-later deals. I have heard that an engine failure/replacement on a diesel can be an expensive proposition, but then I don't hear about too many of those.

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Old 07-07-2015, 11:18 AM   #18
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At work, we used to have a
2011 F350 CCLB gas
At speeds over 50mph on interstates it bounced and bucked. I don't know if it was only when empty or when towing also.

There are quite a few articles on other sites about this phenomenon, have any of you long bed crew cab owners experienced this?
My Theory on the "Superduty Hop" and Possible fix. - Ford Powerstroke Diesel Forum

Have any of you Ford owners tried progressive rate coil springs up front?

Another thing I forgot to mention, buy may be obvious is that the Superduty cab has only had minor changes to the front clip area (when fenders attach) between 1999 and 2015, If you a person likes to fiddle with things, you could buy a body damaged 1999 with a 7.3L and perform a facelift to make it look like a 2015.

Fuel Mileage.
I don't trust the Lie-O-Meter (in dash MPG estimate), it is a nice visual reminder to stay off the skinny pedal. I do regularly hand calculate my mileage, I put on about 300-400 miles per week.

Best
Late Fall 2013
Empty/No trailer
160 miles @ 55-60 outside temps around 50f, through the rolling hills of lakes country MN. 18MPG
I had filled up before I left and when I got back because I thought the LOM was lying more than normal, it was only off by .2mpg

My normal driving is 25 miles each way to work speeds between 55-80mph on the interstate.

Winter
11.5-12.5
(wind doesn't matter as much, but at temps around -15f, it idles a lot)

Summer
13.5-15mpg (depending on head wind)

I haven't towed the AS enough yet to get a good bearing on it, only 80 miles, but I have towed my pontoon, 2007 Southbay 922CR, total trailer length of 30ft, thousands of miles, in all sorts of temps and wind conditions and it pulls much harder than the AS, the pontoon is like pulling a parachute or two pieces of 4x8ft plywood vertically. The trailer is 30ft long, designed for up to a 25ft pontoon.

Normal temps, 70-85f with mild to no headwind in the rolling hills of Minnesota Lake country speeds between 55-65mph, I slow down going up hills and speed up going down, it is a very familiar route, I know the road well.

Typically 11.8-12.2mpg

Same roads, same temps with our typical flat land wind speeds 15-20mph headwinds it will drop down to 10.8-11.2mpg.

I've had the misfortune of towing in temps 88-95f into a 25mph headwind pulling the pontoon also, road speeds of 65-70mph.
At no time is it ever under powered, and it keeps going as fast as you are willing to pay for. MPG drops to 8.5.. it hurts.

For a couple years my wife used to drive a 2004 F250 RCLB 5.4L/auto for work related purposes, that thing with a bowie veterinary box (maybe 2000lbs total between box, meds, and tools) in the back never got better than 10mpg regardless of season, road conditions, or wind.

FWIW, I ran 2 tanks of 20% biodiesel last year and saw no difference in MPG.
The forum members at PowerStroke.org recommend the biodiesel for injector cleaning.
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Old 07-07-2015, 11:59 AM   #19
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I have a '13 F350 6.7 SRW, long bed and crew cab. On the highway, I get between 17 and 20ish, depending on terrain and start/stop. Towing I average about 13.5 to 14. The F250 was slightly better in mileage.

I also have a 2000 F250 with the 7.3. It's still a great truck, but the 2014 F350 is fantastic. Power when you need it. Stopping power when you need it. Smooth and comfortable.

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Originally Posted by Silverflames View Post
I'm interested to hear what kind of MPG people get with the ford gas v10 and a f350 diesel dually. When I get a new truck it will have to be my daily driver, and I drive about 30 miles per day, mostly highway.
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Old 07-09-2015, 10:10 AM   #20
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Pappy what do you get when not towing?
If I stay at 65 I can get 12-13 mpg solo. I am also using a Mike's 5 Star programmer in the 89 octane performance/tow mode. He makes an economy programmer that some folks use and can get 14-15 but it's not a great towing mode for the mountains. The 89 performance/tow mode really wakes up this V-10 and is definitely the gas tow king.
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Old 07-09-2015, 10:20 AM   #21
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Quote:
Originally Posted by Silverflames View Post
Wow! 21 mpg hwy driving that's great!
I think so as well, I can usually pinch more MPG than most people can, especially my wife. Best she can get in town with her new 4 Runner is 15MPG I can get it up to 17MPG.

The 21 on the highway for the F350 is using cruise, shut off going down hill to keep momentum for up hills. Also, if hills are steep I can usually only get about 19. Still pretty good for a 1 ton. This is using the computer and manual calculations. Love the truck.
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Old 07-09-2015, 10:50 AM   #22
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2015 F350 Platinum 6.7 Supercrew 4x4 8ft box SRW gets 11.5-12.5 mpg towing 28ft International.13mpg around town and 17mpg unloaded.
No warranty claims at 14,000 miles.
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Old 07-09-2015, 06:00 PM   #23
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I think I found my truck. 2013 Chevy Silverado 2500 Diesel Crewcab 63,621 miles for asking price of 37 K. That should pull my 9000# 34 footer OK.What do you think?
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Old 07-09-2015, 06:17 PM   #24
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I would look at new ones before I would pay $37,000 for a 63k mile truck.Lots of incentives and back end money right now.Warranty is a huge deal.


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Old 07-09-2015, 06:31 PM   #25
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Quote:
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I would look at new ones before I would pay $37,000 for a 63k mile truck.Lots of incentives and back end money right now.Warranty is a huge deal.


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The way I figure it, a new one would cost me 55 to 65K. The diesel engine should be good 300/400K. At that rate it will outlive me.
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Old 07-09-2015, 06:51 PM   #26
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F250/350 questions

You can buy them cheaper than that.But I wouldn't want to own one of these when the warranty expires.I suggest you pay a little more and get a new one.There is a smaller difference than you might imagine between new and used.I think should $48-$50 on a new Lariat F250-F350 (or Chevy equivalent) diesel Supercrew 4x4 if your a good negotiator.


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Old 07-09-2015, 07:10 PM   #27
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You can buy them cheaper than that.But I wouldn't want to own one of these when the warranty expires.
37 K is the asking price. I would expect to knock of a few thousand anyway. Iw will check on what, if anything is available on the warranty, or an extended warranty. I have been looking and few diesel 250 crew cab/ extended cabs are available. I have not found anything cheaper in a 2 year old truck. As it is I was originally looking for something a bit older and cheaper. I'm afraid a more expensive truck would be overextending myself. In any event nothing is signed yet.

But, if there is a better idea I am open to it. That is why I am posting this.
Thanks
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Old 07-09-2015, 08:32 PM   #28
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Before I would ever buy used, compare the monthly payment for 5 years on a buy at $4k down vs leasing a new one for 36 months. No matter how you figure it, a lease is way better than an out right purchase. This is especially true on a Ford Red Carpet lease. You get a new truck and only pay sales tax on the monthly payment, plus at the end of the lease you can buy it, no matter how many miles you have, without any penalty. Even if you could pay cash, you are better off leasing.
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