Mind you, I've just found an article that says the Mk7 is 0.27 lol...
The biggest problem the Golf will always have is the vertical squared off rear that is the hatch. You need a different shape before that goes away and the number gets much lower.
And reducing it by 0.01 is roughly speaking 0.2mpg.
As I've said before on here though, the efficiencies aren't about you personally saving fuel... VW make 900,000 golfs per year. So just for those cars, a 0.5 mpg improvement decreases their contribution to global warming by quite a fair old amount.
