I don't have the same coach you have but both your's and mine are on a Sprinter chassis.
I don't have a Mercedes dealer near me so I use a Freightliner service department. They sell the Sprinter and can do warranty work on the engine and drive train. I suggest you get it serviced regularly and you might want to check the "Sprinter" discussion as they have good information on systems that are not Thor. Just Google it or I can send the address if you need it.
I don't regularly get 22 but I have. I usually get 18 to 20 depending on how heavy my foot is. Mine likes to meander and not rush; to take it's time. It repays me by giving very good mileage. Check out the Sprinter group.
I check into three different groups to answer my questions. You can pick up good advice in different places. I am looking at Thor because I am consoidering buying one and want to know what owners are experiencing.
Good luck and please post any issues you are having. Comments can help others fix theirs.
Phil
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