I'm getting 20mpg with my 225 /6. All I've really done is replace the carb with a stock Holley 1945 (reman) and swap to GM HEI electronic ignition. That and a good tune up and fine tuning the timing and carb.
wow ....that is great mileage....I am getting 16 MPG in a 68 dart with 225/833 OD and 2.76 open. with electronic ignition upgrade from a 75 dart sport.
I think the engine has never been apart but still does not use oil. I have been told that I might be a lead foot too.
But 16 is the absolute best I have recorded to date. :???:
