Quote:
Originally Posted by bestclimb
I lope along at 1000 rpm frequently l, 5th gear and mph, the engine is smooth so no worries. If I try to increase my speed and the engine vibrates it means I am applying too much pressure to the accelerator or I need to down shift.
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Very good point - at low load, you can go all the way down to idle. When you open up the gas, though, it starts shuddering at that same rpm.
Quote:
Originally Posted by MetroMPG
My experience: I've yet to find a car where (in real world circumstances) the best cruising fuel economy isn't in the highest gear possible without lugging. I don't think the "best" engine RPM/load window is hard to find.
At cruise, the rule of thumb is: upshift, unless it lugs.
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I concur.
Quote:
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Originally Posted by greasemonkee
What about when it shifts into open loop or sub stoichiometeric operation? Seems like an economy loss would be eminent once that occurs.
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Also a good point. I know, from the Scangauge, that my car goes into Open Loop at >95% LOD - pedal all the way to the floor. I monitor that gauge and keep it below that point.