HP, TQ, Fuel Consumption

[oldestof11]

Found this today while doing some VE and VP37 (TDI) research.

180hp/440 tq (converted)


200hp/500tq


Notice the fuel consumption where it peaks in torque. Both of these were done with the VE. The 200hp/500tq graph uses LESS fuel per kW (HP) at a higher RPM than the 180/440...

[Sutter1stgen]

That's some cool info right there. Im glad I got o/d with 3.07 now. I've noticed even with the 6x16s that o/d, and the lower rpm I cruise at, has helped with fuel economy.

[RCCUMMINS89]

Makes sense why my truck gets better fuel economy at higher rpms than my dad's.

[oldestof11]

Which is why my 4x4 4.10 equipped trucks got better mileage than "is possible".

[Mark Nixon]

Slowing engine speed doesn't necessarily help mileage.
'Working" an engine (low RPMs, high loads) will also increase fuel demand.
This is why more transmission gears, with a taller rear gear ratio, tends to work out over fewer transmission gears with the same ratio.

You're keeping the RPM where it needs to be, for the best efficiency, with more gears.
Deeper gears "control" the engine's power range.

I will say that I have gotten my best mileage, which was with 4.10s in a moderately loaded truck, keeping it under 65mph.
That was 28mpg on a 1991.5 with a 5 speed and 2k weight in the bed, on a milder June day in the summer of '04.
BEFORE ULSD.

Mark.

[1STGENFARMBOY]

I also got the best MPG with a 5spd / 4:10's in a flatbed cab-chassy 95 1ton.