Alright I did it… I only drained the two plugs, one in the oil tank and the other large one in the crankcase along with the oil that came out of the filter cavity to change my oil . I then changed the filter and refilled back to the full line, which took 1.08 quarts. The manual states that an oil change should take 1.16 quarts for an oil change with filter replacement. This means that you will leave about 6% more old oil in during a two plug change vs. a four plug change. I for one will be doing the two plug change from now on - and go with it. As a sanity check: Before I drained the oil I first topped it off with oil to be exactly on the full line of the dipstick, and then I precisely (as possible) measured the oil that I removed from the bike. I measured that I removed about 1.04 quarts plus what ever is still in the Utah Sport Cycle bash plate (0.04 quart?). Actually, I measured 1 quart and three tablespoons LOL… now I have to clean up the kitchen utensils before I go to bed tonight so my wife will not find out.