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Old 04-11-2011, 12:38 PM   #62 (permalink)
robertwb70
EcoModding Apprentice
 
Join Date: Jul 2008
Location: Florida
Posts: 135

1991 RED Metro 1.0 Auto - '91 Geo Metro Lsi Auto
Team Metro
90 day: 38.28 mpg (US)

1991 3/5 2 door Blue/green - '91 Geo Metro
Last 3: 42.6 mpg (US)
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I might add the "net gain" is offset by a "net loss" of the power output of the alternator,water pump or whatever the pulley used to turn at a higher speed than it now does. It just happens that most cars are over engineered and can afford to give up some capacity in those systems most of the time, it is possible to go too far though and there are situations where the opposite approach is required (overdrive pulleys).
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