Miles per gallon?

When I was daily driving my 65 with a 200K+ mile 225 and worn out everything else I regularly got 18 city 22 hwy (and that was 65-70mph). As others have suggested, make sure your vacuum advance works, make sure your float level is set to something reasonable, and set the ignition timing to 12-15 BTDC.

If you're getting less than 15mpg, something is out of whack.