What kind of tires are those? Goodyear is the only All-American tire company left. Every other company is partly foreign-owned even if they have manufacturing plants here. Or is that your only requirement? That they're produced here, no matter whether they're a foreign-owned brand or not? Take those G114 Goodyears. They have an H speed rating. 75mph. How many people actually keep them below their speed rating? Is it possible that exceeding their speed rating could be tied to blowouts?