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Old 09-25-2013, 02:11 PM   #13 (permalink)
Allch Chcar
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Join Date: Jan 2008
Location: North Coast, California
Posts: 429

Cordelia - '15 Mazda Mazda3 i Sport
90 day: 37.83 mpg (US)
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Just a minor clarification on Air to Fuel ratios. New engines typically run stoichiometric at low rpm and go pig rich at high RPM. Rarely are they tuned to the otimal numbers. Factory engines are tuned for emissions and reliability.
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