I would like to know what kind of fuel mileage people are getting with these new 4500s and 5500s. Loaded, unloaded, pulling empty and under load.


Also: What is the lengths of beds you can put on these trucks?

braz

10 mpg loaded tp 32,000 Lb. gross. 14 mpg empty 12,500 lb. with 6 speed manual trans.

10 MPG loaded and 14.5 MPG empty(11,800lbs) Thats with the 4.88 rear and the auto

I am getting 2 miles better than my 07 3500 which is around 14. I have 444 gear and it does great.

in town (haven't taken it out on the road yet with a load) empty i am averaging just over 14mpg. that is equivelant to the 05 3500 4x4 quad cab dullie i traded in. the o5 3500 diesel had a 3.73 axle.
the 08 5500 4x4 quad cab has 4.88 gears, but has no bed just rear fenders and a 20,000 hitch plate. i am looking for ways to improve my mileage as is everyone else.

You can go with SRW like the big trucks are doing. If you stay light, 245/70/19.5 would be good for around 10K. I know I'm going with 225/70/19.5 G rated tires. That will allow me 8500lbs for the rear axle and with any luck gain 1mpg on the deadhead.