My 1964 1/2 stang with a new 302 and a 4v 650cfm carb gets about 12mpg in the city(I'm very lead footed  ) and on the highway i get about 18-23 and does around 3,000rpms at 65mph with a three speed auto i hope that helps
Sore
__________________ 1964 1/2 Mustang (Teal Green), Ford 302, Bored .030 over, 3/4 cam, Edelbrock Performer 289 Intake Manifold, Edelbrock 650 CFM Carb, Hooker Headers/Collectors, 2 1/2" Exhaust Pipes, H-Pipe, Summit Glasspacks, 15" Magnum 500's, Cooper Cobra 215/65 front - 235/65 back, Summit 3 1/8" Tach w/ Shift light, 105,000 Original Miles On Body, 2500 Miles On Engine, Interior and All Chrome/Decals are Original and in Great Shape! | 
1965 Mustang mileage 
