using aquadzilla on the 03 duramax/ally combo and yielding the figures shown

Recently towed 8k lb travel trailer for 530 mi. averaged 7.5 to 9 mpg. though i was heavy in the gas 72-76 mph the whole way. this is a 05 ford PSD dually 55,xxx on the truck. - Andrew

I just towed my boat home frome Chicago w/my 00 Dodge Dually Tbo/Dsl. About 8k lbs and got about 15mpg at 75mph.
Mark

Wow this is some good info. I did not realize that the Cummins got such good mileage. I'll be making my purchase in the next few months and this will help.

2005 hd2500 chevy duramax
around town 14.5
highway 15.5 to16
only 3000 mile on it
i hear adding a predator milage goes up about 4 to 5 miles per gal

Just bought a 2006 F250 6.0 King Ranch FX4. I am getting about 18.5 MPG at 70mph unloaded hwy and about 15 combo hwy and city. I have not pulled the boat yet. What do you suggest I do to increase the fuel economy without voiding the factory warranty?

Thanks!

I dont mean to question anyones results, but Sean H's numbers seem a wee bit out of the norm. I don't know the specifics of the vehicle, but I do know that the Edge modules will provide a false reading on the mileage computer on board the vehicle as will most aftermarket performance modules and programmers.

I run an 03' Dodge 3500 Auto Twin Turbo with a completely modified motor, and on a 6"lift with 37" tires, I am getting 16 in the city and around 18 on the hwy. These numbers are running with a performance cam which yields better mileage, and a Timing and duration fueling box.

My mother has an 05' 2500 Dodge auto and is getting 17-18 in city and 19-20 hwy. Her truck is bone stock and has 9k miles on the clock.

Both trucks are 4X4

Hope this helps
Corey

Troutly,

I like them but like my boats and my business I always want better. I guess I am never satisfied. You are talking to man who decided to lab a pair of stock props that were yielding 6% slip at 200 less max RPM.

Any thoughts would be helpful.

That is a good point. A friend here at work has an Edge on his Cummins. The overhead shows about 3-4 mpg more than what he hand calculates.

I have a 2005 Cummins 2500 4x4. Unloaded highway I averaged about 19mpg (hand calculated) the last trip I took. Around town I run about 14mpg and that is going through about 8 traffic lights on the way to work. Towing I get between 12-14mpg.

hand calcs, mileage divided by gallons, its not rocket science.... i have seen plenty of trucks do it plus my own..