I changed the tires on my 2011 at 50,000 miles. Tire mileage depends on a lot of things, replacement mileage will vary. My 2011 Volt came with Goodyear tires. When I replaced them my overall life time mileage was 106 mpg. I put Michelin's on the car and 15 k of driving my overall mileage dropped to the mid 90's. The car did handle much better.
I noticed my 2019 Volt has Michelin tires.
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