Sunoco MO2X (green 112) 14.5 2.7% oxygenated Sunoco Standard (purple 110) 14.85 Sunoco Supreme (blue 112) 14.95 LEADED Sunoco 260 GT Plus (light blue 104) 13.7 4.8% oxygenated Sunoco Race Fuels Sunoco MO2X UL (clear 97) 14.5 2.7% oxygenated Pump Gas E10 14.08 typical fuel at most pumps in the USA Stoich (fuel type) Typical USA Fuel Stoichiometric Air Fuel Ratios Brand Stoich Comments Pump Gas Non-Ethanol 14.64 Does not exist in most parts of the USA The following chart lists common fuels and the TYPICAL stoichiometric air/fuel ratio for that fuel. The absolute most important aspect of custom tuning is getting the fuel model correct so that the ecu has accurate fuel data.Īn often overlooked value that is critical for accurate fuel modeling is putting the most accurate stoichiometric AFR value in your tune. The calibration to incorporate all modifications that the vehicle has been subjected to. This write up specifically pertains to Ford fuel control but the basis applies to all other ECUs / PCMs both aftermarket and OEM.īefore a vehicle can be tuned properly especially a highly modified vehicle it is of utmost importance that all of the base changes are made in
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