I know some people are sensitive about sharing the mileage they get with their old cars, but I'm not one of those people. My '64 wagon has a big block 468 and is likely one of the heavier cars ever made. That being said, as far as I can tell I'm averaging somewhere between 6 and 8 miles a gallon. Is this a crazy mileage, like something might be wrong with my car crazy, or does that sound about right to you? Also, any advice on improving mileage would be welcome.