Hi 1marcelfilms,
I have '99 polo which is very similar to your car. You can see all the changes I've made here:
Grochu Modding Thread
And as you can see it's not hard to go above 50mpg
Fuel Log
I'm finding kill switch and P&G with EOC a key to the success with this car. But it's still in a very early stage of the modding process, so there's more to come... Hopefully
Good luck