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The only disadvantage I remember from driving LPG was the smell of the LPG on your hands after closing the pump. It always sprayed a bit on my hands; a nasty fart smell. I never understood why they didn't add a fresh pine smell or something like that, because LPG is odorless and the smell is added so you can detect it in case of leakage.
Driving with a gas tank in your car is as safe as driving with petrol, even in The Netherlands some people were afraid of LPG tanks, but there is no reason for it. I had a bad car accident in 1991, someone crosses the road were I was on (I drove 80) and the driver hadn't seen me and I couldn't brake in time so we had a collision, the gas tank, which was installed behind the front seats, (I had a two seater) came loose a bit and pushed me into the steering wheel but nothing happened. Yes, I had a huge scar on my forehead (nicely repaired by some plastic surgeon) and a soar back for months. The car was total loss, it was a dark blue one, my next car was a bright purple one (so everyone would see it from far) and the first thing I did was installing LPG!
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