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How much does you GPM go up from having it on at idle speed. Then compare that to your GPM during your pulse with and without AC. That's going to be tough to see, but maybe compare to constant speed at 60. If GPM goes up less at speed, its more efficient to use it accelerating than idling.
You still can't have the throttle as open at constant speed as your pulse but I think the trend could continue. Now if you could find a big hill to go up with cruise set at 55 and see the change. That would be a good test.
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