Hi and welcome to the forums.. ACV36R 06 UPGRADE : is a gen5 model (model before the current ones) MCV36R 06 UPGRADE : is also gen5 model, but dont know the different. could be v6 different or date based but best to ask someone else. ACV40R : is the current shaped model camry's (gen6) If your buying from a dealer, your better off buying the car at a drive away price, so its a final price and no other hidden fees (these usally include dealer delivery (which is bs) gst, blah blah etc ) Im not sure with government cars, i think/heard they use the car to a certain point when the car speedo reaches 20,000km they sell it, best to go to an auction and ask about the car. If your looking to buy a camry, how much you willing to pay tops? i want to get rid of mine, ive got a bike, hardly use the car :)