Re: new ford fuel mileage increase?
Hard to predict, since the mileage you get will be very dependent on your driving type and style.
Some simple rules....
hot rodding is bad, driving easy is good
city driving is bad, highway driving is good
a manual trans will beat an auto on the highway.... no difference in town
Your boost gauge can be considered to be your "inverse fuel mileage" gauge.
I have an '06 F250 6.0 with a 3.73 axle and a 6-speed manual.... 16 around town, and 19 to 21 on the highway depending on load, speed, and headwind.