I currently run a 245 square setup and for the most parts its perfect.
Tires last longer because when you rotate you change the forces applied to the tires. This realigns the rubber molecules so that when you rotate again the rubber is more resistant to the striations that cause the tire to wear.
For example, my sister and I both have SVT H/O 302 2000 Mountaineers. I rotate and she doesn't. We have a similar driving style.
Her tires lasted 35,000 miles. My tires lasted 80,000. I front back rotated every 3K miles.
It's as simple as that.
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