I don’t follow the logic here. What’s the connection between cost and the environmental impact? What’s the connection between the first sentence and the second sentence of this post?

What’s the math here and what’s the “cost of manufacture”, repairs, and cost of fuel and other disposables?

I suspect that the lower cost (which has nothing to do with environmental impact) is due to spreading out the cost of manufacture over 300K miles instead of 100K miles.

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Furthermore, if the assumption that the Prius goes 100K miles and Hummer goes 300K miles is taken as valid, and you add the point that the Hummer gets 10MPG while the Prius gets 40MPG, then the conclusion that the Hummer “will last three times longer than a Prius” is questionable. In fact, the Hummer will be on the road for less time than the Prius.