onourway wrote: ↑Wed Feb 06, 2019 10:32 pmThe difference is that you are only turning for a brief period of time. When tires are of differing diameters, the differential is forced to work constantly mile after mile, for tens of thousands of miles. It is not designed for this.
(I see the same answer was already posted!)
No, you are almost always turning when you are driving. How long could you drive without turning the steering wheel at all? Hardly at all, so the differential is already "forced to work constantly mile after mile", even when tires are identical. Even straight sections highway require gentle steering input, and that's just as much differential action as any difference in tire wear. Unless you think that turning your steering wheel is something your car was "not designed for" then there's no way differences in tire wear could be significant. It is s good idea to use the same model of tires and to fill them to the recommended PSI, but don't worry about tire wear differences. It's just a ploy to sell tires.