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I drive a car with a tall overdrive and to the average person its a pig. Peak torque arrives at 70mph @2450 rpms in 5th. It labors on the interstate. With 2-3 people and some luggage it gets worse. Requiring a downshift to 4th on average hills to maintain the speed limit. The average driver simply would rather have a little more power in place of 5-10% bump in FE. If I could install a longer overdrive for FREE i wouldn't do it in this car. Its right where it needs to be. If it was in taller it would hurt FE.
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