just a note, i put in the tire size from the cheat sheet of the edge....it was 2559,,,,upon doing the rolling distance today the size is actually 2464. this put my speedo and the edge within about 2mph (edge being a little less then the speedo).
i have 18" wheels and double checked everything just to make sure. and the average mpg is awesome. i am getting over 20 mpg on todays 60 mile trip to work. and level three run today (1/4 mile) netted similar results to my level 2. it was alot colder today and i got a huge amount of wheel spin off the line. so i am really satisfied with this product! customer service is awesome to......anyway.....just an fyi.