I've gone 63,000 miles on Goodyear Assurance MaxLifes, and there is some wear on the edges but they're still going. The reason the wear is showing on the inner and outer edges is because I make sure my tire rotations have some sort of cross rotation in them. I only mention this because the two different Toyota dealers I've used will simply swap front-to-back and back-to-front with no cross over even when I ask them to do it. The reason I know when they don't cross them is because I have my tires marked with numbers so I know where they should be after service, and, if they're not correct, I have them do it again. For what it's worth, the owner's manual does advise same-side front and back swaps with no cross for some reason.
So, just a head's up, if you're having your tires rotated at the dealer, there's a good chance it's be a same-side swap and you might not be maxi'ing the life of your tires...