List your MPG on your transplant 5.7 or 6.1

383 stroke gen III xfi 273, 650 vac sec, 727, 3.23, and 28" rear tires - is 17.6 highway in a 1969 Barracuda. It took lots of playing with jets. I put 24,000 miles on it that way, and it was an obsession counting mileage. Although that's an average, and includes extreme summer heat, and winters cold or North Eastern PA.