Now that you have your truck lifted they look cool and have the potential of being very functional, but they may also be robbing you of power/gas mileage. This gear calculator will get you back to a ratio that's closer to your original. Enter the values on the left and press Compute.
This gear ratio and tire diameter chart is meant to give you an approximation of ideal RPMs at highway speed (65 mph) for three situations: fuel economy, every day driving and increased towing power. This chart provides values that represent a 1:1 ratio on a manual transmission. Gear ratio and tire diameter charts are ideal for making your car as efficient as possible.
Note: Automatic transmission RPMs tend to be a little higher and transmissions with an overdrive tend to be a little lower.
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