Quote:
Originally Posted by 3-Wheeler
I can get better MPG even on a 1 degree grade hill, by running in forth at a slightly slower speed, than fifth at a slightly higher speed.
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If I understand correctly, this means going up the high at a much lower speed in 4th gear, but the rpms can be higher than they were in 5th. For example if I'm going up at 45 mph in 5th, then I'd need to go up at an equivalent instant mpg, thus 36 or so mph, for the overall mileage to not decrease. As the rpms can be higher in 4th, then perhaps the speed would be higher than 36 mph.