Optimal MT shift points.

[Bluevitz-rs]

My last tank yielded me 36.7MPG (US) with shifts anywhere from 2700-6000rpm. Most of my driving was conservative, but some was WOT having fun with the new 6spd.

So shifting higher doesn't affect MPG as much as you'd think. The higher you rev the motor (to a point at around 3500-4000) the more efficient it is at producing torque. Bogging the motor below 2000 only causes the timing to retard to prevent detonation which decreases it efficiency.

[BailOut]

Originally Posted by Bluevitz-rs

My last tank yielded me 36.7MPG (US) with shifts anywhere from 2700-6000rpm. Most of my driving was conservative, but some was WOT having fun with the new 6spd.

So shifting higher doesn't affect MPG as much as you'd think. The higher you rev the motor (to a point at around 3500-4000) the more efficient it is at producing torque. Bogging the motor below 2000 only causes the timing to retard to prevent detonation which decreases it efficiency.

The 36 MPG you reported is the fleet average for this vehicle. Anyone trying for higher efficiency doesn't require much torque and will need to shift at lower RPMs to achieve their goal.

Higher RPM always means more fuel usage, and bogging is a thing of the past for the most part. Modern ECUs simply retard the timing to match the state of things. In almost 60k miles of hypermiling the Yaris in the mountains I have never heard the engine bog.