We own a 23 g63 and barely been able to drive since we have other commuter vehicles.
it has about 1100 miles so far and message is popping up for service A. Does anyone know what is done at this service and approximately what they should charge ?

 

The first A service indication appears at 365 days (unless you've surpassed some mileage threshold first ~10K). A1 is an oil/filter change, some inspections and fluid top-offs, and resetting the service interval indicator to advise you B1 is due in 365 days. Prices vary, and some dealers have promotional pricing from time to time. Call your dealer's service department and ask. Expect $250 to $400. Tire balance/rotation is extra.