Review on the new 7.3 Ford V*

JaxDad wrote:
I think you’ll find the issue of fuel mileage is tied far more to the drivers right foot than it is the aerodynamics.

The ‘sweet spot’ of the drivetrain is also important. For a few years my father & I both had exactly the same make / model / drivetrain Class A’s. He swore up & down that driving slower, 60 mph gave him the best mileage. I disagreed. Then we went to the same place at the same time. He held 60, I drove 65 - 70. Low & behold my rig used less gas to do the trip.

I came to the same conclusion after 100k miles of driving and engine mods. Headers, FF mufflers, CAI, advancing timing improved performance by 30 % or so, but no increase of MPG. When I added a vacuum gauge I had in my garage for 40 years and used it my mpgs went up about 1/2 mpg if I use it. The best mpg was above 10" HG. I could also tell when transmission was about to shift from the gauge so I would just back of the throttle to keep it in 4th gear.