Yes, I was meaning that with a hybrid vehicle or diesel running on oil, "mpg" can be used to reflect the very low cost of use but not hypermiling/ecommoding. Of course, I don't mean that the good mpg is only obtained by the additional energy but hypermiling/ecommoding gains are drowned in the overall gain.
Anyway, in the end it's how much you pay that counts. In this sense, 100 mpg is good.
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