The best mileage for a single tank of fuel with my big valve engine was
21.04 mpg heading east on the Pa turnpike. I was not coasting but trying to
keep up with the 18 wheelers 70 mph plus and slower then the fools that
think they will never die I call them bait for the police car man.
The average mpg on the return trip was 19 to 20 mpg and 17.5 in the DC outer
loop it was stop and go traffic. I did stay under 70 for one tank of fuel
going south threw Georgia just to be safe and to see if the mileage went up
that was my lowest mpg 16.5 looking back I don't think I topped off the tank
in the usual manor and there may have been a good head wind who knows cant
say for sure. I did see consistant numbers on the open road on the return
trip
Bob