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
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DJ Phoenix (my modded) Hi-1200/240Tow/75FS/80DD/100/140SS +Minotaur
ASE Master Auto Technician
2001 Ford Excursion 7.3 4x4
Projects. 1970's Hustler and Max II Amphibious ATV's