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Old 2007-05-16, 09:10 PM   #4
Nick Koan
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Real Name: Nick
Join Date: Oct 2003
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Posts: 8,642
 
Car: 2015 Mazda 3
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Yup. There is less air up here at elevation so the Air/Fuel ratio is higher and more resistant to detonation.

EDIT: and yeah, we do use the California gas. Directly from California. So, I'd recommend to run the CA 91 map. What's 5 hp compared with potentially damaging your car.
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