Many people look at the sidewall of the tires on the car when they go to purchase new - this may no be manufacturer's recommended size.
Check on the placard on the door frame to ensure you are getting the correct size.
be aware there is also a speed rating for tires as well as load rating.
And for the wear and longevity, passenger tires are also required to have Uniform Tire Quality Grading, commonly abbreviated as UTQG, is the term encompassing a set of standards for passenger car tires that measures a tire's treadwear, temperature resistance and traction.
I took the description below from the Discount Tire website. their site has descriptions of the various codes:
https://www.discounttire.com/learn/utqg
Treadwear
The rating for treadwear is a relative score given to a tire as an estimate of longevity. It is not a projected estimate of the mileage or tread life. Scores are determined by tire wear in closely controlled driving conditions. The rating for treadwear is given numerically, and is made in comparison to a reference tire given a 100. A tire that scores a 400 in treadwear should last twice as long as a tire with a 200. A comparable tire, made by a different manufacturer, may be given a score of 300.To reiterate; the scores for a comparable tire may vary from brand to brand. It is important, then, to only compare tire scores within a given brand. Actual treadwear may vary based on real-world use. Driving habits, proper air pressure, road conditions, and even climate can affect tread life.
Note: I has been my experience that longer wearing tires are not as quiet, don't have as smooth a ride, and don't necessarily grip the road as well. It seems like a quiet, smooth ride, that really hugs the road is achieved by rubbing off rubber resulting in a faster wear
