Never used anything other than the OEM tires. I couldn't see any reason to do it. First, you would be putting a tire that is the wrong size on to the car. Second, I couldn't find a cost justification. The Bridgestone oem is pretty reasonable at about $55 a tire.

"Speed doesn't have anything to do with mileage. My truck has an overdrive gear for a reason." - Credited to an unnamed Freeper reguarding changing the speed limit back to 55MPH.