Quote:
Originally Posted by ecomodded
Coast down a secluded hill from a set starting point, till you reach a stop,mark the spot. Repeat it in neutral , repeat it all again. Then crunch the numbers.
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In neutral is essentially guaranteed to coast further but proves nothing. The real test would be to see if the extra fuel needed to idle the engine while in neutral is /less/ then the fuel saved by driving the engine with the transmission in gear.