So there I was yesterday, in a CTSW, flying at 130kn in level flight, at about 75% power, burning around 15 litres per hour - in a very new aeroplane, with a great view, excellent ergonomics, and 1000ish miles range combined with the ability to land in 300m from 50ft.
The CTSW is very capable (two went round the world recently) but surely those figures are a bit optimistic? Flight Design website quotes 112kts IAS at 75% power.
On the main point though, unless you need night/IMC or you're flying a classic it has to be the way to go.