So a friend of mine let me borrow his 02 rig for a short 300mile cross country trip I did today in my bonanza. Went up to 15.5k on the eastbound leg, picked up a 50 knot tailwind and saw personal record groundspeeds at personal record fuel burns. Wow I've really been missing out on this high altitude stuff even in a NA engined bonanza. My friends rig is a super basic small medical o2 tank with a continuous flow regulator ported to a cheap nasal cannula. At 15.5k i set the regulator to 1.0 and it kept my pulse level at 95% the whole time. I would like to have something similar to what he has but I would want something for when I have a passenger with me as I typically travel with 1 passenger. My friend suggested just getting a tee fitting for the oxygen line, adding a second cannula, and then turning up the o2 output on the regulator. This seems way too ghetto to me. Will both cannulas receive the same amount of o2? Can two people actually use a medical oxygen rig or would I need two separate tanks and regulators? I looked at the mountain high o2d2 system but it is just more than I'm willing to spend at this time considering I was very happy with my friends rig and it cost him about $125.00. Need input on an affordable setup for two people. Also I've been reading that it's better to go with a pulse demand regulator as it will save o2 tremendously. If anyone has an links for setups or regulators they use please share!