Yeah, but 5 days is still only 1.4% of our yearly consumption. So while quadrupling that number would put like a 6% dent in the US's yearly consumption, it still isn't a whole lot. We might run out of oil a couple years earlier than we would if we got rid of SUV's (depending on how much we have left). To me personally, I'm not willing to sacrifice SUV's and big engines to conserve a small fraction of the world's oil for when we might run out and might still be dependant on it.