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Sounds fishy to me too. I double-checked what you have in the manual, MB says the capacity is 70 liters, which is about 18.5 gallons, so close enough to what the manual says.
Would be nice to see if any owners of the same model can state that they have squeezed in more gallons than this.
Otherwise........well you could go in there with a 1 gallon fuel can and see how close it gets to filling it (checking yourself for a "short gallon"), or you can complain to whoever in your state is in chage of these things. In my state, the people in charge of this, just to try to compare with your own state, is called:
"Weights and Measures Unit, Wisconsin Division of Trade and Consumer Protection".
I can see if you are really really "running on fumes" to maybe take a little over 18 gallons, or if you had fuel "all the way to the top of the filler neck" plus you were running on fumes, OK 18.5 to 19 gallons, but over 20 seems impossible, and that's what I would tell the people in charge of checking the pumps in your state.
Oh and there should be a label of some kind on the pump saying when it was last checked.
Gilly
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