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Sorry just found this old thread. I am experiencing the same problem but while researching I came across the possibility that it is the relay...
OTOH, look on the bright side. If your odometer is that far off, your car has far fewer miles on it than you thought! :D But nobody knows but...
I have a certified used 2011 Prius 1 and I am very suspicious of my odometer. According to it, I have put in 900++ miles since I bought it last...