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a point to consider is that operating a gasoline engine closer to peak torque rpm at certain loads improves bsfc. l question the mpg predictions. 111 mpg at 55 mph seems optimistic.
better aero, along with good door seals, eliminates wind noise. lrr tires make less noise. and a large enough muffler quiets the ice. the high number of ratios in new transmissions are actually meant to keep engine rpm low for low noise and vibration - not much to do with fuel economy. running at peak torque - for best efficiency - negates the extra gears. engine noise will dominate at 100 mph. unless you get a torquey diesel that operates at 1300 rpm.
the 112 bhp opel eco speedster got 113 mpg at 140 mph!
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“Soft shapes follow us through life. Nature does not make angles. Hips and bellies and breasts — all the best designers have to do with erotic shapes and fluidity of form.” - Luigi Colani
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