Data is difficult to obtain, I've been trying to get first hand information on actual bolt failures, it appears to be very rare. Bending is common, factory torquing, at least early on, was improper and allowed the loosening which allowed the bending. From this point I get into VIN numbers and the rain belt and the snow belt. Given the many 100,000 mile equivalency tests and the rigorous shakedown tests the cars were put through it's reasonable that bolt corrections as to type and tensioning took place along with the many other updates as assembly continued. The two who came out with first hand failure experience, Toby and Darryl, both have very low VIN numbers, not very far apart. Mileage alone doesn't really tell you anything, a properly torqued bolt on a late VIN may go forever and an improperly torqued bolt on an early VIN, may fail with very low miles. A poll based solely upon mileage, not factoring in other conditions, is merely a curiosity.