I have a 1951 3100 that has 00841.3 miles on the odometer it was last on the road in 1978. What is the average milage of a truck this age? I know back then people didn't do the traveling that we do now a days so I was wondering what was average for the old days. Is it likely that the odometer has flipped? It seems like 100841.3 is too high and 841.3 is rather low.