Slant 6 MPG Upgrades?

2.76 rear end gears for mileage.

People that do gas mileage competitions say the rear end gearing is the biggest factor to start with. (on the rear wheel drive cars)

Good chance you have 3.23 rear gear ratio on that early push button shift A Body.

What's the car, what size engine?

170 cubic inch slant 6 was the original engine in the '67 Dart I had with 3.23 rear gears and 3 on the tree.

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It gets to the point when you lean them out so far there is not enough Power left to keep up with today's traffic at 70 mph + out on the freeways.