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This thread has proven to be a good read. I know fully understand why my city mileage is so horrible. When I'm stuck in downtown traffic, it's not uncommon for my auto to be shifting at 1500 - 1600 rpm, as everyone picks up fairly slowly. Normally, I hit about 2000. Seeing that my optimum piston speed puts me between 2000 and 2500, I'll try letting it shift at about 2100 or so and see what happens to my mileage. Of course, in traffic, that's impossible, as the Jeep picks up pretty fast above 2000 rpm (I rarely break 3000 getting on the highway, even with short on-ramps, and I still usually pull away from the cars behind me by a lot).
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