Looking for better fuel milage

I'm getting similar mileage in my '65 Barracuda. It has a Comp cams de265 cam with a 600 Holley. The comp ratio is around 9-1 with flat top pistons. You might get another mile or two by tweaking the timing. Probably the best thing to do is install a good set of headers and add fuel injection. I am going to do this when I get enough money saved.