Yes, replace them all. Cost twice as much but you do it half as often
that way. It can cause wear on the drive train. The new and old will
be a different circumference. If you are in snow territory, this time
of year you want the best possible tires too, not a couple of well worn.
With AWD it is common for the fronts to wear a bit faster so rotate them
if you have not been.
This reminds me of a related tire question I had. I bought a new
Elantra in 2013. The tires were pitiful. Two of them had to be replace
after about 20k miles and the other two lasted to about 30k miles. Of
all the cars I've bought new, these were the shortest lived tires I've
ever seen. Roads were good condition.
I replaced them with no-name store-brand tires and so far have 45k
miles on them with lots of thread left. Is that typical of Elantra
Web based forums are like subscribing to 10 different newspapers
and having to visit 10 different news stands to pickup each one.
Just a guess, but probably common. The 40,000 mile tires probably
cost $1 more. Does not seem like it would be much, but when you buy a
couple of million tires, it adds up. I've never had great miles with
an OEM tire. I did get 30,000 out of the last Michelin on the car and
could have squeezed more but was getting ready for a 4000 mile trip
and swapped them out.
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