Do you still have the 'donut' spare?
It would be neat if you could get a full-size rim and mount one of the crappy tires as a full-size spare. Then if you have an IR temperature gauge, someday in the future, put the crappy tire on one rear wheel and do a test to measure the relative temperature differences.
For tires to cause a significant drag, there should be a temperature rise from the generated heat. . . . I'm not defending the Yokos but just suggesting a way to quantify the difference.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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