I've had both cars as standard and as was previously mentioned, the ED30 is about 2mpg worse off... but then it makes up for it in other ways
Just don't ask me what my average mpg is in traffic & speed hump ridden South London...
Having had both models, I used to get 28 mpg in my Std GTI's, whereas my Ed30 would get around 26.5 on average,
This is based on a town centre commute so worst case scenario,
Bare in mind these cars have 2 different sized turbo chargers, one single scroll, and one is twin stroll, so the larger turbo ( ed30) will give you marginally worse mpg.
Remapping to improve mpg is fruitless as all you will be doing is satisfying your right foots curiosity that your car goes more like an exercet missile .
best way I can put it.