On: Prius saves gas money? (follow-up)

[waterlesscloud]

Like the article also says, you don't actually know if you're reducing your "carbon footprint" or not.

You don't know how much more carbon is produced in the manufacture of a prius than the manufacture of a non-hybrid.

[frankus → waterlesscloud]

Price is generally a pretty good indication of resource intensity if you're comparing two things with generally similar level of externalities and subsidies/taxes.

If anything I would say the fuel cost understates the externalities, at least in the US.