Hi
I have a lpg kit fitted to my lexus is200 . It only holds around 36litres costing £26 to fill it and i can get 180 miles out of the full tank. We have the gas service every year and never had any engine problem due to gas over the last two years.
I have just replaced the cambelt kit plugs etc along with a new fuel injector do to a miss fire when ran on petrol.
I highly recommend lpg on lexus