IIRC with a gas conversion you need to start on petrol and switch to gas once warmed up.
Also the gas tanks a very small, like 25 liters and they go in the spare wheel well.
I have been looking into a satisfactory LPG system for my
Cupra. Fuel prices have risen to 1.50 euros per liter
from 1.02 and i am pretty sick of it. I have talked to a few different shops that deal with Italian, Turkish, Dutch systems and so on. Some of them told me that the systems they were dealing don't have anything out for the VAG FSI engines yet, while others told me that the TFSI is no
problem whatsoever.
Petrol prices rose drastically in the last 6 months
or so and everyone is going crazy with installing the LPG kits.
Problem with this is that demand got high. Waiting times to get a kit installed reached 3 months over the summer. This caused every backyard mechanic to go to a few seminars and start installing the kits, resulting in sloppy jobs and problematic installs. This is the reason I was very cautious and did not want to rush into getting the kit put on the car
I will be visiting another
shop soon that I have heard from recent customers only the best
reviews. They deal with a company called Prins. The Prins LPG system has a system they call ValveCare which "oils" the valves so they don't get crispy.
As far as the gas tanks go, you may have the tank fitted in where the reserve tire fits. The tank holds in the range of 55 liters, as much as your petrol tank.
Ill keep you guys posted when i find out more info - if your interested
Oh BTW, after doing the math, the LPG conversion should have paid itself off in about 15,000 - 20,000 km's. That's about the mileage i do in one year. Anything after that can be seen as savings. Price of LPG here in Greece is right around .68 - .70 Euro cents/liter.