Some years ago, I had a '57 Chevy with overdrive. When the overdrive went out, I found that I got the same mileage. Probably because I was in a better power range.
If you have a vacuum gauge on your engine, you will probably find you will get the best mileage at minimum vacuum.
BTW - If you are going up Pikes Peak at 70 M.P.H., you are not interested in fuel economy. lol
Will Willis
Last edited by will6er; 05/12/11 11:56 PM.
