Our club's C182 Turbo RG does 155kn at 75% power consuming roundabout 50-55 l/h. With less power, you can easily do 140kn @ 40 l/h. Really a nice touring aircraft, with longrange tanks and an oxygen system fitted you can climb out all but the most severe weather and have a range of over a 1000nm.
Apart from that, my vote goes to the TB20/21