Screw the 318! I'm going 273!!! Pistons questions.....

My stock bore and stroke 360 got 21 MPG in my 71 dart......when the fours were closed. I didn't build it for mileage. I just built it. I used a thermoquad because I know how to tune them and I knew it would haul ***. I just lucked out that it got the mileage it did. Whenever I build one, I don't worry about mileage. I just build it for what's intended. Worryin about mileage will only result in costing you power you could have had otherwise. Like I said. Go buy a frikkin toyota if mileage is a big deal.