Fuel mileage

[Chamberpains]

When pulling hills, its more important to keep your RPMs up. So keeping boost down at 10 isn't gonna happen.

When you down shift, you should see a spike in boost to somewhere a little over 20 psi. Then it's up to you to do the dance of pulling the hill and yet trying to keep boost as low as possible. I can keep mine under 15 pretty quick after the initial downshift spike. But it takes some serious discipline. And I downshift a lot till i find the gear that keeps my RPMs above 1500 and gets my boost at around 15 psi. I also monitor my tps reading and I can now say I can pull every mountain in the states by using no more than 60 tps or 3/5ths of the pedal and never pushing it any further. This is done with full 80000# gross using a Cummins cm870 450hp Uni-tune, 10 speed, 3.55 rears. I actually have very little need to use more throttle pedal. Except on the occasional short on ramp in heavy traffic. My fuel mileage is in the mid 7's and im just now starting to see 8's after I replaced my transmission and exploded pilot bearing.