Entire trip average 33mpg @ 72mph average. A/c on for 300+miles. 1/2 tank of 87e10, at this point I don't think I will stop using it.
Fill today was over 400miles, forgot actual number, 12.1gal, 33.6mpg! 20% was in/around downtown Minneapolis and surrounding area, parking ramps slow traffic etcetc.
Actually my trip odometer I had set to compare to gps mileage to figure out odometer error on my new tires was 37mpg, 5% city the rest interstate at 72mph