Re: MPG Average over 5000 miles
Long-term averages like this are real-world performance. One-tank or one-trip tests are not of much value.
When I want to test something I use a minimum of three tanks to get an average and look for effect.
2000 F-350 SC 4x2 6 speed
3.08 gears Gear Vendor Overdrive
Rugged Air Dam