to see the car running with LPG.I saw a lot of S-cars have LPG on it.I'd say the performance is not significantly drop.I might say it's the same.If the car is properly tuned.the LP nozzle must be corrected with the car Displacement,HP.
So it need expertised to do the job.MPG is slightly less than Gasoline.anyway,LP's octane is ~105 compared to Gasoline.I have Volvo,BMW&Mercedes
with LPG but Audi ;-).The reason for not installing the LP on my UrS6.I use my car only
6,000 miles/year So It takes too much times to hit the breakeven the cost of LPG equipment.
here's some pics of my friend's S6 with LPG system..



wiring is need more job to be done!!.



Need to drill 2 holes for the gas pipe.