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In my diesel, coasting in neutral with the engine on, the ScanGuage reads 300 to 400 instantaneous mpg. There is no throttle plate creating vacuum and choking efficiency at low load conditions. The computer injects only enough fuel to keep the engine turning over. With better aero I can coast in gear more on long grades using no fuel at all. Fuel is cut off at anything over 900 rpm while engine braking (overrun) in the VW.
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60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun 
https://ecomodder.com/forum/showthre...tml#post621801
Quote:
Originally Posted by freebeard
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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