Bondo: Fantastic results. And glad to hear you're moving ahead again on this project!
For those who don't have bondo's truck's highway MPG ratings memorized, the F150 EPA stat for the 4.6L v8 automatic =
17 mpg (US) highway.
http://www.fueleconomy.gov/feg/2008c...f.jsp?id=22191
Consider also the
maximum speed on the EPA test is about 60 mph, with an average of about 48 mph for the cycle.