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MechEngVT: That's kind of funny... when I first started to try hypermiling, I tried to get my automatic to downshift below 2000 RPM (by letting up on the gas a bit), but it was kinda hard to do without lurching in my Protege, not to mention holding up people behind me in congested traffic. So I've gone to using 2000 to 2500 RPM as my downshift target. When I solve your equation for the 1200 to 1500 fps range I get .... 1988 to 2495 fps. Now I don't feel quite as guilty about letting the rev get up to 2400 to 2500. ;-)
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