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It would really depend on location and route traveled. If you were in something like a Jeep, and drive long trail highway everyday, then changing out the differential would have a big impact. A good comparsion would be my old caprice which had a 2.93 rear ring, it could do 70 on the highway in 4th at 1700 rpm. My buddy with a Monte Carlo has a 3.73. His does 70 on the highway at 2800-3000rpm. Its a huge difference in gas mileage even neglecting differences in motors (carb vs. injection, compression, cams, headers, etc). I could get 18-19 with the Caprice, he gets 13 lol
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