What Size Gears for 33 Inch Tires to Improve Gas Mileage and RPMs?
To improve gas mileage with 33-inch tires, use a gear ratio of 3.73 for automatic transmissions. A 6-speed manual can use a 3.21 ratio. This configuration enhances fuel economy, averaging 20 to 25 miles per gallon under flat road conditions at sea level. Using a 4.10 gear ratio allows for lower RPMs at highway speeds, … Read more