Guys,
It's not mythical; it's fact. The tank does in fact hold 4.1 gallons of fuel when empty. But in order to make it happen, you have to think like an Italian engineer.
Here's the skinny: Last year, Paddy ran out of gas pulling into a gas station. Bone dry, Paddy's tank took 3.9 gallons of gas. And while that's pretty darned close to 4.1 gallons, it ain't 4.1 gallons!
So how do you account for the .2 gallon discrepency? Our resident engineer, Panman figured it out. In order to hold the full 4.1 gallons, the tank must be completely empty. And by, "empty," Ducati means completely void of anything, including the fuel pump!! The fuel pump, (which is housed inside the fuel tank), displaces approx .2 gallons of fuel. So if you remove the fuel pump, thereby rendering the fuel tank completely and utterly empty, (as well as useless!) the completely empty fuel tank will hold 4.1 gallons.
You gotta love Italian engineering!
Elton