The second slurping removed about 1/3 quart. Two ways to accomplish it - set the hose pincher and get the vaccum in the tank set, or no hose pinch and just suck it out with each stroke (kind of sounds erotic).

My parents live in souther NM, and the run from Benson AZ to Deming NM is a great place to "burn out the carbon". And, you are right, early AM is the best time to be one with the gods! Whoa Boy!