Just had my cluster changed out to the escalade and had the cluster sent away to have reprogrammed with new milage. Not saying that it is not stored elsewhere, I just doubt it.Allen never asks for your milage...he sends you a PCM before you sends yours back...so no milage info. The VIN on the other hand is stored in alot of locations. But with Allen's or whomever's, your VIn is burned(flashed) into the replacement. You'll be fine. ANd Allen definitely lets you keep your core. You just pay for it since he doesn't get to recycle it. HOWEVER, if you are doing major mods, like cams and such...don't bother with a core, stock tune wouldn't work well any way. Allen hooks you up with any free updates needed as well....that's the one whole reason he kicks ass. :imoJosh said:allen knows for sure, but a GM tech told me ( who knows how much is true) but the mileage is supposedly stored in 7 locations throughout the truck.