Your example has NOTHING to do with the rotational speed of the engine and EVERYTHING to do with the force needed to push the car through the air. Force required cubes with the square of speed. Less speed = less force, less force = less fuel. Your mileage will rise significantly at 65mph vs 75-80 mph.
Quote:
Originally Posted by MercedesOtto
The efficiency on internal combustion engines is highly depended RPM. If to low the efficiency is bad and if to high the efficiency is bad. I commute 35 miles each way and a speed on 75-80 MPG. The engine refs 3000-3500 RPM.
Next week I will try my MPG going no faster than 65...we will see.
Still hoping to find a 2.88 axle ....would a 300SD axle fit?
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