Quote:
Originally Posted by JamieGeek
Note that in GMTech's post on iRV2 he had determined that the sweet spot for mpg is around 2500 rpm. At 2000 rpm he thought that the engine was working a little too hard causing a higher consumption rate than 2500 rpm.
Thus driving slower may not yield the best mpg (this is independent of wind as wind will be a larger factor when its strong).
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This matches what I see. Under 2000 rpm seems to be almost lugging with trailer.