How do I know what kind of tires to get? The cheapest way?

I have a Honda with185,000 miles on it. It needs new tores soon but i'm not sure which tires to buy. There are tires rated for 100k miles and some rated for less like 40 or 60k miles. Is it best to pay a little more for longer tread life or is it cheaper to go with cheaper tires initially but they have avshorter tread life. I plan to keep the car for a long time. But not sure how to make the decision on which is cheaper in the long run. Anybody got suggestions?

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