Fuel Requirements:

Each map lists the minimum required octane. A higher octane fuel can be used safely on a map designed for lower octane. DO NOT use maps designed for higher octane with lower octane fuels. Top Tier gasoline should be used where available.

• Maps designated with "93" are for use with 93 and 94 octane/98 RON fuel or better with ethanol content between 10-20%.
• 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%.

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.

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. The octane label on the gas pump doesn't tell the whole story. Despite the label, a 91 or 87 octane map may more accurately represent the "93" octane fuel in your tank. 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.

A common example is "winter gas" sold in the northern USA and eastern Canada. In the summer time, the 93-94 octane fuel in those areas is generally in the ballpark of high quality southern USA fuel. However, when it's not summer time, "winter blend" fuels are often sold, without notice of the change being made. Winter gas formulations are designed to aid in cold engine startup and to reduce cold engine emissions. In order to achieve those goals, the formulation is changed and volatility of the fuel is increased on purpose, making the fuel more likely to cause knock. "Winter blend" fuels sold as 93-94 octane in those areas are often on par with 91, or even ACN91 summer time fuel in terms of knock resistance. For that reason, our 91 or ACN91 fuel maps better match winter blend 93-94 octane fuel quality, and no single map (OTS or custom) can fully optimize for the range of fuel quality in that area. 

Please refer to your vehicle’s tow rating/guidelines when using COBB OTS Maps. Vehicles may see higher than normal temperatures while towing using either factory OR performance tunes. We suggest keeping an eye on CVT temperature while towing and avoiding situations where the temperature rises above 240 F.