Had LPG on a 4.2 facelift S8. Prins System. Did ~100K on that with no real problems on the LPG side over 3 years. If you really booted it, it would drop back to gas, but on the whole it was exceedingly responsive on gas to the point that you had little idea apart from at the pump. Cleaner, greener and cheaper.
My current one has LPG but i've yet to really run it as i've issues with the car due to the poor install / Something giving missfires. LPG is fussier than Petrol and shows up faults in the engine earlier!
It's my 3rd LPG car. Love 'em!
Lee
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