I don't remember the EXACT figure, but I ferried a PAX MD11 to SIA for conversion, and I noticed the BOW was significantly higher (all those seats and three gallies and bluerooms).

Of course, after all this stuff is stripped out, the new upper deck cargo door, and floor beef-up adds some weight back on too.

The previous answers about the range issue are correct. With a maximum PAYLOAD, I can't take a full load of fuel. Since we want to make max $$, on the rare occasion, we'll load up the jet and make a tech stop in Japan for gas when operating HKG-ANC. Usually, we avoid any tech stops and defer loading space A freight, so it's a max weight taxi and takeoff out of China for the states or Europe.

PS. The MD will fly a LONG way with a full tank. Our first MD delivery from conversion flew non-stop from Singapore to Louisville (at least 9700 miles) 17+ hours, full fuel, no payload, no problem....