5 or 6mpg is indicating a problem...have you checked vacuum or rebuilt the carb yet?
The cure is better heads, 3.03 gears in diff. (if not already there).
If you want even better:
aluminum intake
carb spacer (for heat dissipation)
better cam
better lifters
2.02 heads
4 speed auto trans
3.03 gears in diff. (if not already there)
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