While it`s possible that the Carfax mileage may be wrong , I strongly feel like E-Man that it is more correct than what the seller says it is , whether or not the seller is being honest about it . If it is wrong , has the seller contacted the agencies that report the mileage over the years to straighten it out ? I often check on E-Bay and Fl. Auto Trader on El Caminos for sale . I am very often shocked by the " little white lies " and outright " fraud " , that I see , especially when it comes to mileage . If they are not honest on the milage , what else are they not being honest about ? As the others said , it is important on these older cars to check them out for their actual condition and the milage alone should not usually be a deal breaker . The best way is if you can yourself , have a knowledgable friend or mechanic check the car`s systems , fluids , including rust . Most people do not bother to do it but it`s best to pay a few bucks to a place and put the vehicle up on a lift as that is the only true way of verifying the real condition and what it may or not cost you later on .