I've got a 9 miler. There aren't a lot of different ways to get to work from where I come from. I do however tack on an extra 10 mile loop beyond work just to ride in the mornings. It's almost always in the dark, and there are few people around. It's good clean fun.
The best part is, it's still a quick 9 miles back home afterwards and I get home in a reasonable amount of time.
I would definitely ride out of my way for 1.50 PBR...