Around town, I don't really check, on the highway I get low to mid twenties per gallon. I use Sunoco 93 octane. Stock '66 BJ8.
As an aside, on the highway, the speedo says I'm going about 70 mph. (just nudging the yellow on the tach, although the tach reading seems to change day by day) BUT, I'm being passed regularly and my handheld GPS puts the speed in the mid 60's mph.