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Old 01-15-2010, 05:25 PM   #7
JL8Jeff
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Quote:
Originally Posted by creeper View Post
my car probably gets best gas mileage at 55-60ish. stupid automatic.
I have the automatic also and 65-70 is definitely the best speed for fuel economy. Most engines sweet spot is around the 2200-2500 rpm range. If you change rear gears it will start to throw things off.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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