Congrats on the new ride!
Check the date codes on all the tires. 7 to 8 years max life. Check the service records on the motor and generator, fuel system, oil change records, etc. These items will be the big maintenance costs.
The fuel mileage will be a shock initially, 6 to 7 mpg I would suspect, perhaps a touch higher. If you spend a lot of time traveling this will affect the budget. We travel from point A to point B then stay for a few months so our transportation costs are kept down. Plus we look into volunteer positions that provide free sites and electric to keep costs down.
GS #822128658, Escapees SKP #112655, FMCA #F431170
2006 Country Coach Magna, 2012 Jeep Liberty