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Maybe 25 MPG is possible?

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Depends on how far you want to go. I think you have everything scienced out to a "T". All I can come up with to help you get that number is:

1. Pull the 275's off and replace with 235-70-15. They are the same height as the 275 and will get rid of a few inches of rolling resistance.

2. Put 215's or better yet 195's on the front.

3. Go 60 mph

Some more drastic measures:

4. Lock-up torque convertor.

5. Lower the car as much as practical.

6. 3.08's

Nice to see you are making progress on your project