Mine is the mixer type. You can get away with it on a GEMS engine but not a Bosch engine owing to the way the igntion system operates. Backfires are more of a problem with the Bosch (later P38A and the D2).
Sequential gas injection is the preferred method for both. If I keep mine, I'll convert it to SGI.
The conversion cost the previous owner $3000 in Sept 2001. He was ripped off. Also he had problems with it and wasn't using it when I bought the car in May 2002. I had a lot of problems with backfiring. It destroyed two expensive airboxes (which I repaired many times).
The toroidal (doughnut) LPG tank is in the wheel well. The spare is on a wheel carrier but I'd be happy to strap it down on the floor in the rear or get a mount to carry it like is done in a RR Classic. I fitted that tank. The original install had a large cylindrical tank crossways behind the seat which prevented the use of the rear compartment for anything. I couldn't even fit my wife's wheelchair in the back (when she was in the chair).
The usable capacity of the LPG tank is 54 litres which gives me 300km range on a trip. I still have the 100 litre petrol tank (but I have a 155 litre long range tank yet to be fitted).
Conversion done by Andy Francis in western Sydney. I wouldn't recommend him.
Power loss? Dunno. Not noticeable.
Ron

