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Old 08-17-2012, 12:13 PM   #4 (permalink)
ksa8907
Master EcoModder
 
Join Date: May 2012
Location: Tampa, FL
Posts: 1,745

Volt, gas only - '12 Chevrolet Volt Premium
90 day: 38.02 mpg (US)

Volt, electric only - '12 Chevrolet Volt Premium
90 day: 132.26 mpg (US)

Yukon Denali Hybrid - '12 GMC Yukon Denali Hybrid
90 day: 21.48 mpg (US)
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Not possible. If you're interested in engine mods you should start with the air delivery and exhaust, then combustion chamber, port matching.... Roller bearings if you really want to throw time and money around.
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