Monitoring your vehicle via the Accessport and selecting the OTS calibration that best suits your current fuel quality allows you help your engine run safely, while retaining as much extra performance as possible.Ī common example is "winter gas" sold in the northern USA and eastern Canada. Despite the label, a 91 or 87 octane map may more accurately represent the "93" octane fuel in your tank. The octane label on the gas pump doesn't tell the whole story. If significant knock (more negative than -2.8 degrees) is present when using 93 octane calibrations on 93 octane fuel, switch to a map that is intended for a lower octane fuel to better suit your fuel quality. If you'd like to keep things simple and aren't interested in monitoring and switching maps to maximize power for premium fuel, the 87+ performance map allows you to run any quality gas in the 87-94 octane range, which is available at almost all public gas stations in North America. Maps designated with " 87+" are for use with 87octane/91 RON fuel or better and work well with 87-89, 91 (ACN and otherwise), 92-94 octane fuels with ethanol content between 0-20%.Maps designated with " 93" are for use with 93 and 94 octane/98 RON fuel or better with ethanol content between 10-20%.Top Tier gasoline should be used where available. DO NOT use maps designed for higher octane with lower octane fuels. A higher octane fuel can be used safely on a map designed for lower octane. Each map lists the minimum required octane.
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