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Tires are rated differently for treadwear - that should give you a rough idea of the differences between the life of one set of tires and another.
As others have said there are lots of variables: how you drive, the temperature, the condition of the roads you use, the compound of the rubber in the tires themselves...just to name a few.
As for 195/55R15 84H
195 = tread width in millimeters (mm)
55 = aspect ratio, the sidewall height as a percentage of the tread width (195 mm x 0.55 = 107.25 mm sidewall)
R = radial tire construction...all tires are radial now
15 = the wheel size this tire fits, in inches
84 = load rating
H = speed rating
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