I took a standard thinner can and emptied it, rinsed it with gasoline and proceeded to fill my empty 3.2 IMS white fuel tank. It on an '05 450 EXC. The first gallon brought the fuel level up to the top of the square aluminum subframe (8-3/4") from the flat bottom next to the fuel valve. The next gallon took the fuel level up to the bottom of the vertical line- just behind the tank cap opening (11-3/4"). The last gallon did not even fit. I filled it to 1" below the top of the tank cap opening. I then poured 40 ounces remaining from the one gallon can. 128 oz X .7 = 89.6 oz ( I figured 88 oz a little below the filler cap). 2.7 gallons This is not a problem for me. That's all I really thought I would need. The question is: Have other KTM riders found this to be true? If you have different results and feel you're right, I'll give in right now. After the oil change and the gas measuring, the bike looks more like Exxon Valdez than an EXC. I still need to remove and measure all the fuel when I get finished riding tomarrow.