The best I ever did was 29.5 with my 72 Duster. 1bbl 198 long rod short stroke with 3:23's and a 3 speed manual. Usually got 25.4 highway. This is running pump 93.

I added a Holley 2bbl from a 318 headers, .090 off the head, lots of porting, really tight lash. It dropped to 22mpg.

I swear the 2:74's or 2:76's lug the slant and suck the gas.

Dad had a 73 Valiant 4 door that got 13. Slush box PS and air.

I was getting about 16 with my 74 auto 2:76 PS 4 door Dart. I reset the lash tighter than stock, tuned it and got 18+ before it sucked a rag into theoil pick up

I have a post with pics running right now.

"The only thing to do for triumph of evil is for good men to do nothing"

"NUNQUAM NON PARATUS!"