In the early 90s, American Honda did a mileage challenge to all owners. The deal was who ever had the most miles, verified, w/o a rebuild, would trade thier car in on a brand new accord at no charge. The winner had an 86 accord h/b w/ 700,000 miles. What Honda did, was put it in thier research facility, and ran it to see if it could reach 1,000,000 miles w/o a rebuild. In the end they did, but it took several years. Of course they didnt publish it, because they simulated optimum circumstances. No cold starts, no hills, or loads. In the end the engines are as good as they say....even if I always got crap ones.