Math's a Wonderful Thing

So, someone (essentially) said to me, "who cares about how you drive if it's only making 10% MPG difference". This seemed a tad odd to me. I mean, if you're spending $1500/yr on gas with sloppy habits, improving your driving habits is going to save you $150 over the course of the year. It's also going to tend to save you on other, longer-term wear-and-tear expenses, but, just the gas differential should be enough. Whatever: I'm a cheap bastard. So, 10% reduction in an expense seems worth it, to me.