I'd be curious to know what your engine's BSFC chart looks like compared to a HP/speed load chart for your car. If I had to guess, I'd say you're managing to land on or close to that "island of efficiency" that occurs with a thus-and-such torque load at so-and-so speed, and that just happens to be at 75mph.
Grab it and growl, man. Laugh all the way to the bank at high speed.
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Lead or follow. Either is fine.
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