No, they are actually quite good. For example: I went to Alton Towers the other week, in my GT4 and it was 150 mile round trip. I filled the tank completely from half way, cost me £38 (forgot how many litres it was) and when I got back the tank was down to half again. Now thats 80% dual carriage way/motorway, doing the speed limit, I worked it out to be roughly 21mpg. If i went in my old GT I would of expected to use maybe 1/4 tank of fuel. GT's have very small fuel tanks so 1/4 tank is only like £10.