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Old 08-17-2014, 09:15 AM   #2 (permalink)
ksa8907
Master EcoModder
 
Join Date: May 2012
Location: Indiana
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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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Are you sure the display is accurate? Depending on the engine design and what kind of camshaft the engine has, it is possible to have higher efficiency at higher engine speeds, just not likely. Over 3-4 thousand rpm, friction increases and efficiency is lost as pressure in the exhaust builds up.
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