Opinion on 1998 kw t800 n14 460 13 speed

a friend of mine bought a 98 W900 tall sleeper last fall for his son to run
flatbed only. combination local / roadwork
60 series Detroit
last quarter of 17 ifta miles were 7.3 mpg
he did the first quarter for 2018 on Saturday morning and texted me 8.41..
I know his son isn't light on the fuel peddle either

he has a 2007 daycab that he drives which is an international with a C15 Cat and can only muster 6.1 mpg from that

 

I think you'll be disappointed. IMO, a T8 wont be appreciably better in your application than a 379 with the same engine. Any fuel savings will have to come from the engine, gearing and driver.

 

Fuel mileage worries and your solution was a C16?

 

My experience is drivers use all the power (fuel) you give them. Curious why you think a sloped hood and fairings will help MPG’s on a car hauler

 

I'm betting mid 5's

 

Good spec.. Need to keep eyes on frame. Older KW with 8 rear air bag suspension had issues with frame cracking at front leaf spring hanger!