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Old 09-24-2013, 06:36 AM   #2 (permalink)
elhigh
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Join Date: Jan 2008
Location: SE USA - East Tennessee
Posts: 2,314

Josie - '87 Toyota Pickup
90 day: 29.5 mpg (US)

Felicia - '09 Toyota Prius Base
90 day: 50.48 mpg (US)
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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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