I don't understand how you'd have a legal standing by having your driven tires wear out faster than your non-driven tires and needing to replace them within your lease period. Sure, it might piss you off because you didn't factor it in to your cost of ownership, but GM never says they'll provide warranty on the tires due to wear (rather than manufacturing defect, which they will cover). If they did, they'd be buying me a LOT of tires, as I only got about 4000 miles on my front tires before they were down to the wear bars! Can you imagine how many tires they'd be buying for Corvettes, Camaros, etc. if they had a mileage guarantee on the OEM tires?The tires are not unidirectional. The tires can (and should) be rotated left to right, but not front to rear. Sounds like you got some bad information from the spark advisor.
As I said here:
http://www.mychevysparkev.com/forum/vie ... 4&start=10
BryceFor those with 3 year leases, I HIGHLY recommend you get better tires on the car right away. Drive the car for the next 30,000 miles or so with much better tires and enjoy it. When you're nearing the end of your lease, put the Ecopias back on it before returning it. I guarantee you won't get 36,000 miles out of your Ecopias on the front...so if you need to buy new tires, you might as well buy them now and enjoy them instead of buying new tires for the next person down the line.