I've found that with my auto, it doesn't actually make that much difference. Normally, I let the big V8 shift around 2200 - 2500. Below 2200 the torque converter is too slushy for it to be efficient, and mpg drops. Unless I start pushing it above 3000 or so, I don't notice a difference on the high end.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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