my quick search says LPG-installed cars run at 5-10 bar. the roadster apparently at 350 bar. by comparison one is on the scale of car tires and the other is like 35x that.
For reference, tractor trailer tires run about 7 bar and we’ve all see those videos.
But also LPG is extremely flammable, while air isn't, and air can be safely leaked in emergency.
Using Brode's equation a rupture can release 52MJ of energy or 12kg of TNT. An high explosive tank shell only has 11MJ of explosive energy.