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Old January 14th, 2008, 09:05 AM   #21
Haggar
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Originally Posted by UP_ROKTOY View Post
thats a gas truck, my point is that diesels WILL get great mileage in the 40-60mph range. I don't doubt 17 mpg at those speeds. but you will not get that mileage towing a load at 70 mph.
He doesn't appear to have been towing That was an empty truck.
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Old January 14th, 2008, 05:53 PM   #22
kickstand
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He doesn't appear to have been towing That was an empty truck.
I know. that was my point.
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Old January 14th, 2008, 06:32 PM   #23
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Originally Posted by Haggar View Post
Two things here:

1) The fuel usage meters aren't very accurate, and are calibrated on the optimistic side. I'm rather curious about the bully dog setup... is that a piggy back? Know how they work, on a signal level? And how those signals are also used to calculate estimated fuel usage? Bully Dog is a programmer not a piggyback chip. The Outlook module lets you switch between power programs on the fly.

2) Most importantly, varied between 40-70, probably a 55-60 average, and I'm guessing in the UP... which means flat, straight, and very few stops. Average was more like 65mph and not flat or straight with about a dozen or so stops. One stop was for 10 minutes idling in the customers driveway.

I can completely see that mileage for that situation, unloaded truck (sled does nothing), those driving conditions.

For example, no matter the vehicle, when I visit my parents (180 mile round trip, completley flat very few stops, 55mph two lane roads, in the thumb), our vehicles get 20-30% higher mileage than our normal mileage. Last trip there with my V10 dodge, I got 11.7mpg towing an 8500lb load (large tractor with loader, forks, other stuff), that be 8-9 mpg down here.
The tires are brand new slightly oversized winter tires.
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Old January 18th, 2008, 10:03 AM   #24
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In my 07 6.7 liter my overhead was over about 1 mpg. When it said 18 it was 17. That was with the stock 265/70/17 tires. With the 315/70/17 I have on it now, when it says 16 I'm actually 17.2. I have also noticed that it is very dependent on your driving habits. Around town I average between 11 & 13, on the overhead, when I drive it & my wife averages around 15 on the overhead.

On my brothers 07 5.9, he gets 19 all day long & if you watch the overhead it was always between 20 & 23. His is a manual & mine is a auto. He has a cap & I have a tonnue cover now, but didn't have anything for awhile.
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Old January 29th, 2008, 09:06 AM   #25
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The best mileage I have ever gotten with my 05 6.0L powerstroke towing 9K lbs was 13mpg at 70mph. The best I ever got with my brothers 01 DMax towing the same load was 12.5mpg at 70mph. I have gotten 19-20 mpg at 70mph cruise control but no load and no stops highway driving.
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