hello all, i'm looking in to a 05 378 pete. 63 stand up bunk, 10 speed, 3.55 rears. it has a 475 c15. not too sure if its acert or not tho. anyway, at 70-75 running 30000lbs gross, if i knock it down to a 435 do you think i can knock 6.5mpg or better? oh this is in a dry van. oh this is also on flat ground 100% of the time.

How you going to get 30000 gross, you'll weigh more than that empty.

Try knocking the 70-75 down to 55, then you might get 6.5 mpg

i haul us. mail. that is no weight what so ever. what do you figure the mpg would be around 70-75?

i'm also looking at a 05 volvo with a 400st isx.

No. It will probably get worse. It is an Acert, and if you could run it steady at 1300-1350 rpm, ON A FLAT GROUND, you should get 7.0-7.5 mpg, or better. Running 70-75 at those specs, would do you 6.0 at best, but i wouldn't bet on it. If you want a CAT, to run at those speeds, look for 3.25 or higher. That's wont be a problem on a flat ground. Make sure your torque is 1850, than you might get 6.5 mpg, if slowing down, is not an option....

looks like its the ISX for me.. thanks for the imput all.

2005 C15 Acert, T2000 KW, 475 hp, 35,000 - 80,000 lbs, 75 mph, 4.8 mpg.

I have a 2004 c-15 acert 475 13 speed, 355 rears, 5.5 at 80,000 and 6.5 empty

unfortinaly that is way off where i want/need to be.

me too, but you learn to live with it, at least I can pull a mountain.

HAHAHAHA i bet the volvo will get 20mpg too doing 75mph.