What difference can one little letter make? With better gas mileage and more power than the Audi TT, the 2009 Audi TTS proves the answer is, quite a bit. Cars.com’s Joe Bruzek had the chance to take the TTS out for a spin on the back roads of Georgia, and while we won’t give away the entire video review, the words “turbo-fun” do leave his mouth. Watch the full video to find out his other impressions of the TTS.