Drag, speed, and efficiency

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Drag, speed, and efficiency

Peter Moore
Hi Jason, I've been watching you videos and I was wondering about an interesting thing. At what speed (and RPM) would an average car be the most efficient in terms of MPG. Drag increases pretty much quadratically with speed I believe, as well as greater tire friction at higher speeds, but at higher speeds, the engine isn't putting out that much power (so isn't burning that much fuel). So, say you're driving on the highway; what speed is most efficient?
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