my bora went from 130bhp to 170bhp, economy on a run has reached 63mpg, but i did have to drive smoothly to get that after a bit of hard driving.
it's odd pottering about just over 1100rpm in fifth everywhere, but that gets around 50mpg.
flooring it ruins economy like all cars, but i average over 10mpg better than the misses with her 206 xsi 1.6 petrol and she drives quite smoothly.