FRTYMPG (40MPG)
Shortly after getting my Mustang, hot hippie in a Prius pulls up to me at a light, and with my window down, screams at me that "you are fucking killing the environment in that thing!!!" The whole thing started with me wanting to get a Fuck Your Prius sticker, but in the search, came across a website that had a bunch of funny import/domestic related decals. Found one that said 30+MPG. Then 40+MPG. Went with that (pictured on the drivers side rear window. Friends of mine thought it was hilarious, and it became a huge joke at car shows, etc. Well, time to renew my plates, and I said fuck it, and got it. 40MPG was showing as an invalid format when I tried online, so I had to come up with an alternate. Just found out recently that the site is not always right, and I should have put down 40MPG as my number 1 choice. Damnit!!
As a side note, I get a shit ton of comments on it, lots of questions, and usually some good laughs out of it. The car is loud as hell, and I don't drive it like a grandma, so the irony in it is pretty funny.
Decal site is
www.ihatestickers.com (NSFW)