BigSteele

iTrader: (17)

At what rpms is the engine most gas-efficient?
In 6th gear the rpms are lowest, but maybe the engine stuggles more at a lower speed and would waste more gas than if it was in a lower gear. Whats the best rpm to stay at for best gas mileage?
Kenny

P Mack

iTrader: (6)

I think the only reason you'd want to use 5th gear instead of 6th gear is if you're at low rpms and high load (going up a long hill or something) and it starts pinging. The only other reason I could think of is if you have to give it so much throttle in 6th gear (above 50% or so) that it goes into power enrichment, but you still may be better off in 6th than in fifth.

99 Black Bird T/A

iTrader: (4)

I think all gas engines tend to be at their most efficient at peak torque. Someone else might be able to give better insight.

JamRWS6

I think he is talking fuel efficiency......that certainly wouldn't be the case being peak torque is over 4K RPM.

My guess would be in the 60 mph range in 6th gear.

luv2spd

iTrader: (1)

I agree. Somewhere between 60-70 in 6th for max fuel economy.

P Mack

iTrader: (6)

That's volumetric efficiency, not BSFC.