I had quite a long argument with Prius owner about this. He asked what mpg I got, so that he could boast about getting 63mpg as opposed to my average of 22 (it was my old thirsty Focus at the time).
I countered by asking how many miles per year he drove. He told me 30,000, so I pointed out that even at his 63mpg I would use less fuel over the year simply by virtue of driving less. He soon shut up.
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