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the little light makes sence but not at 15lbs.
if the light came on when tires dropped more than 5lbs of eachother then it would increase tire life by letting us know that ones getting low.
fuel mileage would be better, handleing better.
that is if when the light came on the tires were then brought back to the recomended pressure.
go 1000 miles on a tire thats 12lbs low and you know the difrence when you finaly get it aired back up again.
i bet i could check tire pressures on 99% of cars and each tires varies by no less than 5lbs.
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