I am not familiar with any way to recalibrate it exactly... however my recent set of tunes was spot on when I filled up today where as the previous set which had some of the same tunes was off by 2-4 miles a gallon... I was using several different tunes on one tank too as I did about 250 miles of pulling my 3500 lb trailer
Oh ill take some of them 40mpg injectors too
