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Only thing I havent figured out yet is when its best to use 5th gear vs 4th during low speeds. At 45 mph 4th gear less than 2k rpm's I can keep the vacuum at 20in. If I shift to 5th the rpm's drop and so does the vac down to 15in since the engine is working harder. I'm just not sure if the rpm drop offsets the increased load. The 4th eye will tell me just dont have it yet
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The motor is at a lower RPM and higher gearing so MPG is almost surely better in the higher gear. You can't compare vacuum readings at different RPMs. Just look at a BSFC chart to see how different the efficiencies are at different RPMs.
At lower RPM, bigger throttle opening, higher gearing you have:
1) lower pumping losses
2) lower frictional losses
3) other advantages I can't remember
I've observed this with my mpguino. Git'er up into those high gears ASAP
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