Good evening Steve.
That's correct the Rv is dual fuel.
I might have misled you as she runs on one or the other not a petrol lpg mix.
The engine is the Ford Triton 6.8 litre v10 petrol.Apparently one of the most lpg conversion friendly engines there is.
The actual conversion make is Romano.
How it works is the engine will only start on petrol,after a minute it will automatically switch over to lpg.If the lpg runs out it will automatically revert to petrol.The actual monitoring of Lpg in the tanks is done on a square switch on the dash panel with four lights,four being full and when the red light comes on you're empty.Unfortunately they are not accurate so when I'm down to two lights I look for a petrol station to with Lpg.
The last time I took it for an Mot the examiner checked the emissions whilst running on lpg as they are far less than if checked on petrol.
Just after we bought the Rv I had an engine warning light appear.To cut a long story short the lpg needed adjusting,it was all done on a lap top plugged into the diagnostic socket.
The only problem is there isn't a British standard kite mark.Basically at the moment anybody can set up a business fitting lpg conversions to any petrol driven engine without proper training or guidance,there is a list of Lpg recognised fitters and these are used by the Rv dealers in this country.
Unfortunately until our government set up some sort of standard you have to be very careful who you allow to work on your vehicle,this is why when we travel to France we have to use the cross channel ferries as no Lpg powered vehicle can use the Channel tunnel.
There was talk of converting a diesel engine to Lpg but apparently not successful at all.
ps. hope this hasn't gone on too long.