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Which is the best air/fuel ratio for a gasoline engine?

Retry Correct Incorrect 14.7:1 is the best stochiometric AFR or air/fuel ratio for a gasoline engine for it to perform at its best. However, some people manipulate the ratio depending on how they want their vehicle to perform.

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Which is the best air/fuel ratio for a gasoline engine?

• 15.3:2
• 2:1
• 14.7:1
• 6.4:1