Mileage drop

[Floorboard79]

See these two links for how i did it, then the code i used. I havent taken the time to tweak it to less than 1% off yet, im pretty much happy where it is
http://www.ford-trucks.com/forums/1460787-forscan-spreadsheet-8.html

http://www.ford-trucks.com/forums/1460787-forscan-spreadsheet-10.html