I recently needed to get gas for my car (not an uncommon occurrence). There's a "no-name" gas station that's on my way to/from work that I usually go to, particularly since they're about $.05-$.10 cheaper than the other stations, including the one across the street.
I paid $1.79... ish. Why ish? Because the price was $1.78 9/10. I don't get that.
First of all, why the 9/10? Have we ever paid 7/10 or 3/10?
Second, we always round down when we talk about gas prices. In another endeavor, .9 is rounded up, but not gas. So I tell people I've paid $1.78, when really I've paid almost $1.79.