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Installing an overdrive transmission makes a huge difference in highway comfort, engine wear, and fuel economy. Keisler illustrates this in its "Best of Both Worlds" speed table. Engine rpm at highway speeds are approximately one-third less. This means 4,000 versus 2,500 rpm with the 0.64:1 ratio OD. You will actually be able to carry on a conversation without yelling! Keisler states most customers report a huge fuel-economy improvement. The company's own Maximum Overdrive Corvette gets 25 mpg on the highway with 3.73:1 gears. View Related Article
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