2005 2500 Quad Cab 4X4 with 345 c.i., automatic, 35" tires, and 4.56 gears : between 8-10 m.p.g towing (5,000 pound travel trailer), 11.5 in town, and 14 leaving town.

 

Don't know if it's true but I agree. On many occasions I have gotten better gas mileage from driving 75-85 mph. Mainly in the interstate. Averaged over 17mpg on a trip from KY to FL with a motorcycle in the back, prolly a total of 700 lbs total. Pulled a car trailer with '60s model cruisers from KY through the hills of WV and TN and got about 11 mpg. Normal daily driving @ 60% interstate gets about 14-15mpg completely stock.
So i agree to drive it hard, just don't get a ticket,

 

16 mpg average in my 2008 5.7 quad cab, 4x4. 17" wheels with stock tires, flowmaster 40 system.

 

07 mc 4x4 hemi 70k 19mpg highway 14 town

 

02 Qc 4x4, stock 20's with 34's 4.7, 9.1 mpg

 

I have a 02 2500 4x4 8ft bed with a 5.9 magnum and on a good day I get about 10 mpg's But I'm not complaining I LOVE MY TRUCK

 

This thread is 5 years old and keeps going, and going...

2007 - 5.7 HEMI - mods in sig - 14mpg (mixed driving, hand calculated)

 

4.7L Magnaflow Cat back Duals, K&N CAI, 265x70x17 3.55 gears.
average over the last year has been 14mpg, not acceptable that a little bitty V-8 with stock tires and wheels can not do better than that. It gets 9-10 with a small trailer behind it. 14-15 otherwise. I like the power but think for the mileage it ought to be a LOT MORE POWER, I had a big block 460 ford that did almost as good and it ran a LOT BETTER.

 

all stock 2007 4.7 except a flowmaster 40 muffler swap and lucky to get 13.5 in town on a good day while babying it

 

My MPG varies quite a bit... especially depending on where I get my gas. Last time I reset the MPG calculator in my truck it averaged around 11.9 for about 500 miles. But, I'm pretty sure that was a few tanks of winter gas, because it's never been that bad. Before a 250 mile road trip yesterday I filled up and reset the calc, and I actually managed to get 17.7 MPG on the highway the whole way. That was with the cruise set at 70 MPH 90% of the time, which is about 1900 RPMs. Everything is stock except for the exhaust, which is a Cherry Bomb glass pack dumped before the rear axle.