If you're saving a $1 in fuel today, then in ten years doing the same thing you'll save more than $1 because fuel will cost more. I'm not sure it's a useful ch

If you're saving a $1 in fuel today, then in ten years doing the same thing you'll save more than $1 because fuel will cost more. I'm not sure it's a useful characterization, since inflation affects everything, but it's not wrong.