First off i am using my Efi Live V2 Scan and Tune. At the moment am just trying to recalibrate my speedo for my 35s (34.25" actual height). In the ECM Speedo calibrations I can put in the tire size correction but when i hit apply it will not adjust for the correct size. Although, in the TCM it will apply the correction for the tire size but i don't believe that is it doing anything anyway??? Need help so that my mileage/mpg calculator is correct. truck is only 1 week old.