Believe it or not, since I installed the nozzles and the chip I definetly get better fuel consumption, but if you step and push on the throttle down all the time, it may very well be a different story, but if you drive it like you usually drive the car before modding it, you should see an improvement in MPG, at least I have seen 2 miles improvement in my golf and Jetta TDI.
But what you are going to like a lot is, when you touch the throttle with your foot just a little, that TDI becomes a beast, it really wants to take off.
Happy modding to everybody.