I don't believe the 65mph is a precipitous threshold where below it you're perfectly OK and above it you're always dicing with death. Tires fail usually because of heat and load, and yes, they will get hotter the faster you go. But just how hot they get must depend on other factors, too, like the ambient temperature, road surface, tire pressure, etc. So I think speeding up above 65mph for a while in order to merge with the faster traffic in another lane is probably quite OK even with 65mph rated tires On the hand I wouldn't exceed the rating on a sustained basis, especially on a very hot day.
Paul
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