I normal see 14 per tank,,, all small town driving, with a 20 mile run or 2 per tank, all at 55-60
I did fill up this past Sunday, to the rim, aired up tires to 75 all around, and drove to Indy and back. 489 miles round trip refilled at same pump as that morning, at my station. and seen 16.5 MPG 70% of trip was at 60, with 150mi or so, at 68-70.
I was both surprised and happy, gonna leave tires aired up,, maybe drop the rears to 65.