Switched from bald General Altimax 175/65R15 to new Hankook Kinergy ST 185/65R15 and saw zero mileage decrease when factoring in the 2.1% size difference. I got them because they were nearly $100 cheaper after tax for a set versus comparable 175/65R15s (Came out to about $300 including installation thanks to combining a couple promos this summer). Plus I've run them on other cars for a while and they're fantastic tires. If you get the Kinergies make sure to get the STs not the GTs or PTs. The STs are the only Kinergy tires with high ratings.