I just put some 305/65/17 Mickey Thompson ATZ's on my 2007 JK and was wondering if the digital MPG display will need to be calibrated to the new tire size to be accurate. My previous tires were the stock 255/75/17's. Im sure the speedometer will be off, but Im not sure if the MPG display works in conjunction with the speedometer of something else.

 

I will post some pictures of the new Mickey Thompson ATZ's and M/T sidebiter wheels soon. I just finished installing them and it is too dark outside to take pics.

 

You will need to recalibrate it to get the proper readings. Dealerships do up to a 32" but anything higher you'll need an AEV Procol or a flashpaq.

 

That's what I was thinking. I will order the ProCal and make the adjustments. Im planning on regearing within a few weeks anyway. I will need to calibrate everything after the gear install, so I might as well get ProCal now. Thanks for the reply.