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Depends if it's a consistent 70-75 mph.
My commute is stop and go but the average consistent speeds are about 70-75 and I average 28-29mpg. I'd like to think if there wasn't any traffic for a week I would average higher. During trips to Boston where I locked in the cruise at 74 mph I averaged over 30 mpg for the trip (if memory serves me it was about 33-34 mpg).
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