With the help of my lovely wife, we calibrated at the Dynon the capacitive fuel probe. The tank WILL NOT accept the advertised 16.5 gallons as a tri-gear with the upper Longeron level, about 14.5 was all you could get in before it dribbles out the filler neck. We propped up the nose wheel and got 16 in it, we could have likely got a little more but as a practical matter I think "full" is 14.5 gallons.