Depends upon the way you drive on them. When properly inflated and rotated the last user is correct 75,000 to 100,000 miles on average, even on the cheapest set of tires.
Definition of morpheme. : a distinctive collocation of phonemes (as the free form pin or the bound form -s of pins) having no smaller meaningful parts.
morpheme (plural morphemes) (linguistic morphology) A smallest linguistic unit within a word that can carry a meaning, such as un-, break, and -able in the word unbreakable. The word pigs consists of two morphemes: pig (a particular animal) and s (indication of the plural).