If you run the math, a worn out tire in that size will over report miles by 2% vs a brand new tire with full tread depth. I.E., it will appear the vehicle is getting better mileage than it actually is.
LRR vs non-LRR mpg will certainly show up on high mpg cars, but new tires WILL consume more energy than worn tires.
And finally, they're sumitomo, what did you expect?
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