You must have a portable O2 concentrator to fly and none of them go beyond 3 LPM continuous. I use an Inogen G2 to fly as well, and that setting of 6 gets you .84 ml if you only breathe 15 times a minute and drops from there as your respirations increase and it only works with pulse. The max the machine can put out is 1.260 LPM and that's according to the manufacturer's specifications. Also for a flight to Rome, you'd probably need at least four batteries unless you have the 24 cell ones, and then you'd still need three.

As for Rome, I'd consider renting a scooter to help you get around. That will give you much greater mobility and will allow you to do a lot of things seated and that will save O2 and battery power.

What is trelegy

aah you mean a scootmobile ! a scooter in Rome is something else!!!! I get you now ....yes that is a good idea.

I'm talking about an electric three wheel scooter; not something you'd drive in the road. You drive this where you walk. When you walk in Rome, you're going to get the pollution, but this won't put you in the street on a something with a gas engine and two wheels.......even I'm not that brave!

With quality of air levels in Rome, I think a scooter is a VERY bad idea! It might sound fun and romantic but its the opposite, right next to lorries and big SUV's big exhaust pipes !!! sorry Jean most of your advice is super sound !