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85,007 miles is certainly impressive. No wonder you want to stay the course, both with the brand and the pressure...and for a reasonably priced tire as well. i just looked up my tire on the Bridgestone/Firestone site and it's more expensive but has a shorter warranty than almost every other tire fit for a Yaris on the site, which serves to confuse. I mean how are they deemed "high performance" if they don't last? So did you notice a difference in the way the car handled when you went back to the FR710s or just fuel economy? I wonder if the more expensive tire you were using was also heavier. perhaps the weight contributed to the worse mileage, along with your inability to inflate them beyond a certain point. Regarding the free air, the gas station where i filled the tires offered free air and i thought I was seeing a mirage. Now i'm thinking maybe the chuck was more worn because the air was free. Or maybe the air was free because the chuck breaks your valve stems...
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