Sorry wmudriver, but you're wrong. Name anything else that will do 170 knots no sweat at 12-14 gallons per hour. Which, incidentally, is about 50 knots faster than a 172 while only burning about 4 gph more in the process. The answer, nothing. You are correct though, the R model is LOUD, loud enough for me to get an ANR headset for when I teach in it.