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Old 04-12-2013, 11:36 AM   #1 (permalink)
Blue Angel
EcoModding Apprentice
 
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Join Date: Feb 2013
Location: Ottawa, ON, Canada
Posts: 190

Previous Car - '12 Chevrolet Cruze Eco MT
Team Chevy
90 day: 44.29 mpg (US)

535d XDrive - '16 BMW 535d M-Sport
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Tire Diameter Change In Fuel Log?

Just wondering if anything has been considered to add a variable in the fuel log input for a change in tire diameter?

An easy way to effectively make your car's gearing taller is to increase your tire's diameter. For example, going from a 25" tall tire to a 26" tall tire will effectively give you a 4% increase in "gearing".

The issue with this comes when logging fuel data. Your car's odometer has no way to compensate for the change in tire size so your reported distance will be 4% shy of your actual distance travelled.

Is/has there been any thought of adding this feature to the fuel log? I may decide to put taller tires on my car for winter driving next year, but if I do so it will get complicated to track mileage with the fuel log.

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2016 BMW 535d
4100lb XDrive Eco-Yacht
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