My 76 wagon, 60K mile 2.3/auto, 185/75 tires was getting 14 mpg with almost all original stock parts. Installed new brass terminal cap/rotor, MSD 8.5mm wires, NOS 76 carb, new EGR adapter gasket & Iridium plugs & briefly got 21mpg before the engine started running rough & now I get 14 mpg again.
I have an 86 Ranger shortblock with 40K on it, a fresh D-port turbo head, 81 D-port carb intake, NEW 2014 manufactured Weber 38, NOS 76 Distributor & Duraspark box, Ranger header, 2" mandrel bent exhaust, 2" IN/OUT Dynomax muffler & a T5 5-speed to swap in. I'm shooting for 24-28 mpg