Congrats on the new E63! I had an E55 also - kind of jealous wish the wife would let me pick up a new 2012
Gas Guzzler Tax: Program Overview | Fuel Economy | US EPA
The weighting is apparently 55% city, 45% highway so I don't think you make it.
Maybe you can keep us posted if the car will truly get 15mpg city - I got 10mpg in the E55 all day long despite a claim of 14mpg LOL.