I've heard also that the Michelin MXV4's improve fuel economy, so they could help pay for themselves. Browsing the tire selection at my local BJ's wholesale club ($110 each for 15" MXV4's) reveals differences between the MXV4's. There are at least two, probably four, different MXV4's: MXV4, MXV4 plus, Energy MXV4, MXV4 plus Green-X. What made me look closer was the treadwear rating being 400 on one of size, and 340 on another similar size. I'm talking 205-65-15 vs 205-60-15. Makes me wonder why Michelin did this.

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Robert W. Roe
1984 300SD 165,860 miles