I think air is old school and over rated, I have moved on.
LPG is the go it is heavier than air and the bike stays more planted on the road.
I don't need to carry a gas bottle for a cuppa I just plug the burner into the valve stem,
If the bike fails me I can blow it up.
I run with Dangerous goods signs and road users give me a wide berth like Harleys but without the price tag.
If I get a punture it acts as a refridgerant and cools me down while I fix it.
Its the BOMB
get on to it!