Engine power is unchanged, Max shift rpm is slightly lower (and probably better for the power curve, LOL). It simply up and downshifts earlier at part throttle. His issue is not related to sporty driving where you would use sport anyway. The difference between D and E around town is minimal other than the smoother character of E and D holding gears a bit longer. OMG, what was VW thinking by putting that on a GTI.Of course it is or it wouldn't be there. All performance is muted in Eco mode.