Ha ha, that was pretty good.
Almost 368K miles on my 2004 Corolla. I knew about the odometer getting stuck at 299,999 miles, so when it got to 299,998 miles I pulled off the freeway and went into a residential area and drove very slowly watching the odometer. The very moment it turned to 299,999 miles, I hit the tripometer button and have kept track of my mileage that way. I know exactly how many miles are on my Corolla: 299,999 miles plus 1 mile plus keeping track of each 10K mile tripometer cycle gives me the exact figure.