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I don't think we have ever seen 10 mpg in our Axis. We are approaching the 10,000 mile mark where the V-10 usually picks up a tick or so on the mpg meter and even with that we are still at 9 and below (only recently got 9 on flat terrain with gunny off and A/C off--we were towing a car though).
As far as Michbout's other questions:
3) water pump: yes switch it off when city water is connected
4) A regulator is a safe bet--I don't think there is one on the coach (doesn't appear to be one on ours)
5) black/grey tanks: kitchen sink and shower go to the grey tank, bathroom sink and toilet go to the black tank. Fouled black tank sensors are quite common thus the meter may read 1/3 full even when the tank is empty.
The dealer's recommendation is correct: it is safe to leave the grey tank open when connected to sewer but keep the black tank closed and only empty when full or leaving a campsite. It is good practice to have the black tank 2/3 full or more when emptying to get it flushed out.
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