The rip off prices is typical of shell and BP some have been so bad you are better off using a bit of petrol to get to the next LPG filling station. I have seen 10p variation from 2 filling stations opposite each other! One flowgas and the other BP.
A lot of petrol cars now are going direct injection. The injectors need to be cooled or will melt when running LPG. For these engines there are two ways to convert them. 1) still run some petrol through the petrol injector at the same time as the LPG. The downside of this is you are using about 20% petrol so conversion repay is longer.
2) run the LPG through the petrol injector. This means running liquid LPG and modification to the petrol system.
The big downside in both cases is they need manufacturers time and development to make the system work reliably. That means the kits are car/engine specific and cost more, install cost is also then higher.
There are still normal engines out there but the choice of simple to convert cars gets more limited the newer you go.
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