I religiously rotate my tires every 5k miles and check pressures. Yet, for the three vehicles I own (Tundra, RX350, Soul) and many in the past (Volvo XC60 R-Design tires were dead by 15K miles), the OEM tires do not make it past 25k or 30K miles before needing to be replaced. They wear evenly, they drive fine, and we drive mostly back country roads (not highway, not city, long winding roads with few stops). Once replaced the second set of tires easily goes +50K miles. Why are OEM tires so bad?