My '49 Dodge D30 (3.91 rear end) was getting about the same mileage right around 14. I added a second outlet to the exhaust and went to a holley 94 carb. My mileage is now right at 19 mpg and the ol' girl has really picked up some power. I too am looking at going to a 3.55 to 3.21 rear end to make her a little more comfortable as a daily driver. (Well I'm also looking for a new rear end that is a little narrower. I've got a set of 8" wheels I want to put under her. Any body got an old A body rearend?)
