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Old 09-13-2016, 05:24 PM   #155
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I get 12-13 mpg towing at 60 to 65 mph.
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Old 09-13-2016, 06:44 PM   #156
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2016 Ram 2500 6.4 V8

Towing a International 27FB - I averaged 12 mpg at 67 MPG recently from Michigan to Denver.
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Old 09-13-2016, 07:25 PM   #157
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Anyone running with a tuner on their diesel for additional mpg? Every time I research this, my head swims.


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Old 09-14-2016, 03:46 AM   #158
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Originally Posted by GettinAway View Post
It's ok mileage, but with the fuel capacity I have, I don't go too far past 200 miles on a tank.
This was part of the reason I changed from gas to diesel. The extra MPG of diesel over gas helps, but the larger fuel tank really helps. Came very close to running out of fuel near the middle of nowhere New Mexico this summer and said, that was as close as I wanted to be to actually running out of fuel.
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Old 09-14-2016, 04:54 AM   #159
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Originally Posted by FishByFly View Post
Anyone running with a tuner on their diesel for additional mpg? Every time I research this, my head swims.


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because I catch fish on a fly...

2017 25' FB Flying Cloud Queen
2010 F250 Lariat
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On the subject of tuners...
I suppose it depends on what year your truck is but in general, tuners make me nervous. Certainly, with my 6 month old Ram, the owners manual states that any attempt to use a tuner will render the vehicle unable to start and subject you to voiding of warranty.
As the silly truck makes something like 800 pounds feet torque, has averaged 18.4 mpg overall for the first 8500 mile, 16.5 mpg towing for 2000 of those miles (all while not even broken in yet...) has the cleanest tailpipe of any car I have ever owned, makes really, really great sounds, shifts like it can read my mind... I simply can't imagine what the gain would be!

Now, if I owned a Ford 6.0 and wanted to "bulletproof" the engine I'd think about a tuner as part of a package...but I'd want one as part of a system of improvements engineered by a big company with a proven track record.

My concern about modifying modern vehicles is that so many of the systems are integrated that simply modifying software in one area, say shift firmness, doesn't necessarily take into account everything that might be happening.
This software gets complex and the trucks manufacturer has simply got to have the most complete picture of what is actually happening.

The other thing about tuners is that finding objective reviews of their capabilities is virtually impossible.

I once got bitten by the bug and when my previous 2010 F-150 had about 75,000 miles on it, I decided to see what I could achieve with a tuner. I read everything I could, talked to companies tech departments and decided to try one. I got the thing, read the instructions and loaded the "canned" (not custom) tune into the truck. It was a mild tune and it did not promise anything earth shattering, just something like 30 extra horsepower and firmer shifts.

I left the tune in for about 1 month. The only real difference I noticed was that the engine seemed to ping under load. Just a soft, barely able to be heard gravelly noise... To be honest, there was no real improvement in performance, and my fuel mileage was about what it always was.
I didn't like the noise the engine made and called the manufacturer and asked why the knock sensors where not seemingly remapping ignition under load...
They told me that they were but just less aggressively.

To make a long story short, I removed the software after about a month and sold the tuner (lots of 2010 F-150 owners out there). My truck returned to its quieter ways and actually seemed much happier again.

About 12 months later I received an urgent sounding email from the company who made the tuner that insisted that the tune software be removed from the vehicle. Seems that the knock sensors had been deactivated in the software and damage could result...
I passed the info on to the new owner of the device and was pleased with my decision to get rid of it.

Nope, no tuners for me...
Bruce
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Old 09-14-2016, 08:48 AM   #160
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Originally Posted by wbrisett View Post
This was part of the reason I changed from gas to diesel. The extra MPG of diesel over gas helps, but the larger fuel tank really helps. Came very close to running out of fuel near the middle of nowhere New Mexico this summer and said, that was as close as I wanted to be to actually running out of fuel.
I agree. I'll be nervous for sure when we go to Alaska. I've been through on a bike, and there are some 200+ mile stretches without fuel.
I just can't justify the $$ of going to diesel. Plus, my truck sits quite a bit. Its used on the farm, for pulling the trailer, and hunting trips.
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Old 09-14-2016, 03:50 PM   #161
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I have found on my car, the "lie o meter" is quite accurate to within a 1/10 or so.. some like mine, unless reset, is showing average for the entire time.

labor day weekend we traveled up to NH and my MPG on dash was showing 28.7 MPG. after the long drive up and back it now show 29.8. my hand calculation shows actual mpg at 32.9 (lot of tail winds both ways )

The problem with a truck when you tow some times and not tow sometime the computer is basing the estimate of MPG on past gallons used and miles traveled, so yes the lieometer could be inaccurate for sure.

the best way, by far, is write done miles and gallons at every stop.. You can use an app like fuelly or do it with a note pad on the dash like i use..

for best fuel prices i like gasbuddy.com with the phone app to find cheap fuel where you are or where you are going.



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When my gallons used shows a number at the pump, the nozzle clicks off within a tenth. I have checked it at every fill up and it is consistent.
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When checking your mileage, do not go by the tv display calculator but do the math. The onboard "lie-ometer" is notoriously inaccurate in most cases. My 06 Ram 3500/4wd/Cummins/dually shows a consistent 16-17mpg towing an 07 Classic Limited, 29'. Doing the math shows in the 12-13 mpg with which I am happy, towing in the 60-65mph range. I note the same variations driving empty, from 20-22mpg by computer to 17-18 by the math.

I notice similar variations in our 2014 Subaru Outback, but variation is only about 10%.
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Old 09-14-2016, 07:12 PM   #162
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Mpg meter on my '04 Dodge is within 3/4-mpg high.

21-mpg average last 50k miles.
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Old 09-15-2016, 06:31 AM   #163
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@fishbyfly and Bruce B-
Another issue with tuners is emissions. As thousands of VW "clean diesel" owners can tell you, emissions compliance is about more than not making visible smoke, especially in a diesel. High combustion temperatures lead to the formation of nitrogen oxide, a major smog component and Diesel engine manufacturers go to great lengths to manage combustion temperature with various devices including exhaust gas recirculation. EGR does not help fuel economy, so a "fuel economy tune" may reduce EGR, for example. It's also illegal to tamper with your truck's emission system, which is probably why Cummins has a no-start built into the software.
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Old 09-16-2016, 07:29 AM   #164
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@fishbyfly and Bruce B-
Another issue with tuners is emissions. As thousands of VW "clean diesel" owners can tell you, emissions compliance is about more than not making visible smoke, especially in a diesel. High combustion temperatures lead to the formation of nitrogen oxide, a major smog component and Diesel engine manufacturers go to great lengths to manage combustion temperature with various devices including exhaust gas recirculation. EGR does not help fuel economy, so a "fuel economy tune" may reduce EGR, for example. It's also illegal to tamper with your truck's emission system, which is probably why Cummins has a no-start built into the software.
I know several dodge owners who removed all their emission systems and they run good... And they do start..
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Old 09-16-2016, 08:07 AM   #165
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We get 18.9L/100kM (about 18.2 US mpg) pulling the AS in mixed terrain at about 90-110kmh (55-65mph).
Our average FE for 2016 is 8.3L/100K (28.4 US mpg) with mixed driving and about 10% pulling the AS.
Very happy with the Q5 TDI
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Old 09-16-2016, 05:34 PM   #166
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I didn't use a tuner the first 175k on my truck since I didn't want to screw up the transmission. After I had my torque converter upgraded and transmission rebuilt I put a light tune on with a Smarty Jr. I gained 1.5 mpg on the highway and 1 mpg in the city. I'm not a huge fan of runners but the one I have was designed for the stock transmission in mind and only changes the timing and duration so it doesn't hurt the injectors.

My brother took the egr off his 08 Cummings and went from 14 mpg on the highway to 19-20 on the highway. The next truck I get once the warranty is up the egr will come off. Bottom line is do some research on the tuner and weigh the risks on adding it.


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Old 09-16-2016, 06:36 PM   #167
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2009 Chevrolet Silverado 1500 crew cab, 4wd-off, ac on, Goodyear tires @ 50psi pulling 76 Argosy 26 @62mph on I64 (moderate hills) from Evansville IN to Louisville KY = 14+/-mph; not towing avg 17 mpg.
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Old 09-18-2016, 10:38 AM   #168
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Back yesterday. 2014 Sierra 1500 Denali 5.3 4X4, crew cab short box, @ 700 miles camp loaded towing 2005 25ft Intl CCD,
10 gal water up and back down from So Calif. to and around Sequoia Natl.. Forest.
1000~7000 ft elevations and some pulls up long grades in between. 55 to 65 usually on the long stretches. 12.7 MPG
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