Just retirned from a 1400 mile trip. Some mileage data is now available.
The driver of my Explorer for the entire trip was my lead footed, jack rabbit starting son.
The first leg of the trip was from Sarasota, FL to Atlanta, GA. There were two adults in the truck. The mileage was 523. The average speed was 81.4 MPH and the mileage netted 28.9 MPG. This was using Mobil 87 gas with Fuel Power. I use the same Mobil station for fill up every time in Sarasota, therefore the pump automatic cut off point should be more or less the same each time.
The next several hundred miles was in town driving with some highway driving and I did not determine mileage since I am interested in only the highway only mileage. We did switch to the 93 program and used Amoco 93 gas; fully taking advantage of that cheap(er) Georgia gas.
The return leg from Atlanta to Sarasota was run using Amoco 93 gas ( using the same station every trip ), supplemented with Fuel Power, with the SCT Programmer switching to the 93 mileage program. This trip was 512 miles, average speed was 76.4 MPH, and the mileage was 31.4 MPG. This portion of the trip had 3 adults as well as a dog and a fully loaded truck.
My thoughts: Speed kills, I am certain that the trip speed and driving procedure definitely cost mileage. It appears that Fuel Power indeed enhances mileage.