The Infiniti OEM tires are just average. Bridgestone's recently introduced Ecopia tires offer a stated 12-percent improvement in rolling resistance compared the company's previous model. The Bridgestone Ecopia EP422 may deliver on the promise of being fuel efficient, but I read that they trail when it comes to wet weather traction.

Has anyone tried using these?

 

I haven't tried them, and wouldn't. IMHO, there's just too much compromise to the sportiness of the car with a set of tires like that. Besides, they are fairly expensive and basically defeat the whole purpose of a 'sport sedan'.