best mpg comes when cruise mph = peak torque rpm

 

Thats not necessarily true. Its best when the available power is best able to pull the load. Unfortunately on my van that doesn't hold true. I have a table-top flat torque curve and my MPG is best at 75 mph in OD (1,800 rpm) and drops when I downshift to 3rd (2,600 rpm). The MPG is worse cruising 55-65 mph in OD or 3rd. If I try to run 80+ for very long, the large frontal area works against me and it starts to DRINK fuel.

 

I will try with 65-70 mph on my next longer trip and see where the mileage goes, will probably have my laptop connected and keep an eye on the Trip screen. I guess Lean Cruise will do some good also.

 

I am just wondering where the middle or avg torque is on your torque curve.

It is common for max torque to be at max VE for any peticular engine.

 

Hey ya'll,

What is with the valley of death in my low speed VE. I am on my 15 or so WB learn with EBL. Car appears to be running better each time, but this appears to be questionable.

BB TBI - 20psi - 90# jectors