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With my small engine I find it impossible to keep in BSFC ideal zone when climbing a steep hill, unless I drop at least two gears. Then my instantaneous mpg drops to about 10 mpg. I can easily accelerate downhill in the BSFC zone and then climb the hill in 5th, at BSFC zone, at 35 mpg.
I might add, I don't pick up a huge increase in speed on the downhill sections, seldom EVER exceeding 55 mph in all my driving.
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