Have to take into account the amount of rubber on the new tires compared to the old is pretty drastic. And The fact that you are actually traveling further per rotation of the tire now. May not seem significant but that adds up in a hurry. Just my take on it. I saw a massive drop in mpg when switching to new tires I blames most of it on the non LRR but have to attribute at least some to the additional weight ect.
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