Quote:
Originally Posted by MetroKindAGuy
So, Is it more effecient, to rev higher at higher vacuum reading, or should I shift to 5th and concentrate my efforts to keep the lowest rpm.?
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more efficient, less economical.
you'll make more power for a given amount of fuel burned (more efficient)
However...
you don't need that much power to maintain speed (less economical)
once you're in top gear keep RPM's as low as you can and still maintain speed for the optimum MPG