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You're only going to be 2% off. When you think you're going 50mph you're really only going to be doing 49. For every 1000 miles you go, your car is going to report 1020 miles.
My tires are larger than stock, so I'm 3.4% the other way. The Subaru store says that they can't flash the cluster, so all I do is multiply the odometer by 1.034 when I fill up. Other than that, I wouldn't worry about it.
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Originally Posted by sheepdog44
Transmission type Efficiency
Manual neutral engine off.100% @∞MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%
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