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update: this tank had 7.6 gallons of 93 in it the rest was remaining 87 there was 120 miles of interstate speeds the rest was country roads and city with a bunch of hills (northwestern pa) the first trip i didn’t floor it once and i was trying to let it break in this tankful there was several heavy acceleration pulls. id say premium def yields better fuel economy just can’t say exactly how much. either way the numbers i’m seeing are a lot better than my ‘15 with the 2.4 it would average 24-25mpg on the same trips