it's probably been asked a lot, but i didn't find it.

pullin a new 5th wheel and w/my aux tank, gen set and misc bs, i'm probably about 15k gcvw. w/the 3.55 and auto tranny my manual states 16 k max. 95 model, 160/400 right?. on a recent 2500 mile trip i found we just don't have the *****. on flat level stretches w/no wind i could hit 70 w/a full pedal. most of the time it was 60 ish w/almost a full pedal and 50 in 3rd on hills. in the smoky mountains i spent a LOT of time in 2nd at around 2200 rpms and 30 mph. o/a trip mpg was 11.77. on the frwy 12.66 was common even w/a lot of 3rd gear. i know theres lots that can be done to improve performance, at the expense of fuel economy if i hear right. been talkin to mike at hot rod diesels bout engine and tranny mods, but what about just goin to a 3.73 or 4.10? would either make much difference
if i'm drivin 65 at a higher rpm wouldn't i use the same or less fuel if it's pullin easier than my foot to the floor goin 65 now? also, i noticed that often, it didn't matter if my foot was 3/4 or to the floor, speed was the same, WU.

john

kdp tabbed, KnN