Just purchased a set of Goodyear Endurance tires

It makes sense that the Marathon's would have had the same speed ratings, the Endurance are a direct replacement for that tire. I called and tried to get some technical info regarding the differences between the Endurance and Marathon tires last week. Of course the lady on the phone mentioned a stronger sidewall and scuff guard which I can read online. It really sounds like the Endurance is just a rebranded Marathon made in the USA.