Those numbers are unsurprising given the 3.3T aircraft, and the last 3 (?) airports being German (Fraport) owned. I don’t think you can do anything with a Fraport one for less than about €300, for any weight. The new owners increased prices 5x to 10×.
LGIO should be well below €100. I paid about €50 Sep 2018, for a fuel stop.
A search for fraport digs out all the details.
