Do you know if you can run LPG in a supercharged engine?
Putting LPG vapour through a Supercharger will tend to dry out any lubricant in the rotor bearings which will end in Supercharger seizure sometime down the line. If such siezure does occur, it might just result in the snapping of the drive belt and a hefty bill for a new Supercharger unit. It could also result in a bill for a new engine if any broken Supercharger fragments are inducted.
We are not speaking of a friendly little pop now and again, more like an eventual (inevitable) explosion of large enough magnitude to take the Bonnet (and maybe even the Driver) with it.
the only way a Turbocharged or Supercharged engine can be converted properly (safely) is
by using a correctly selected and installed multi point injection system.
So only about 5-10p cheaper per litre than here in the UK.
The rule of thumb used to be around 15% - 20% cheaper in Poland depending on the exchange rate. The last couple of years its been all over the place. I remember Feb last year the Zloty hit 4.15 to the £1.