Had around 45mpg many of times, normally on a 20 mile trip sticking to 60 and just very light throttle coming out of one or two 30 zones in the right gear.
Modern petrols can be great if you want them to be, and 45mpg from a 2.0 turbo hot hatch is crazy. Couldn't pay me to have a mordern diesel
Normally it was around 27-33mpg when pressing on In my gti, I dont really clock my mpg as that's not what I bought it for just sometimes check to be curious but it's good to know if you needed to save some penny's etc you can.