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That fuel efficiency chart is BS. Every car or truck I've had with overdrive got it's best gas mileage at 65-70 mph. 55 mph will result in a loss of gas mileage and an increase in gas/oil use. And the newer 6 speed vehicles would probably get the mileage at 75-80 mph.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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