If the engine isn't suffering from detonation. Adding octane improver will decrease the mileage a slight amount. If the engine was suffering from detonation, then yes efficiency would improve when detonation was stopped. As for mileage at on speed or another. It's an irrefutable law of physics that air drag increases with a square of the speed. That is going twice as fast takes four times the energy. Going 3 times faster takes 9 times the energy. Most reciprocating engines are most efficient at the rpms where max torque can be developed. A few hundred rpms either side of peak on a gasser isn't going make beans for difference in efficiency.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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