What are mid 90's Alfas like on LPG?

>As the time to actually buy a new car approaches, I just an inredible
>thought. While the Saab has to go, period, I could get something with an
>equally juicy engine if it could be run on LPG.
>
>While I said before, no V6's because of economy, maybe that wouldn't be
>the case if it could safely and comfortabley run on LPG instead of
>petrol.
>
>That would put the 155 V6 and possibly the 164 v6 (only possibly because
>of the sheer size of the vehicle) firmly in the affordable luxury
>cruiser bracket. I know the conversion might cost way more than the car
>(depending on whether the 164 keeps climbing in price), but it wouldn't
>take long with a V6 to reap the fuel benefits, especially if I keep the
>car for a couple of years, and move it on before fuel duty on LPG equals
>that of Petrol.
>
>What does everyone think?

Personally, I refuse to play the governments silly games with fuel duty. If
everyone converted to LPG tomorrow, the government wouldn't hesitate to put
duty on LPG up overnight. I noticed today that diesel at the local garage is
now more expensive than unleaded. Did it not used to be considerably cheaper?
Surely this isn't because of the increasing use of diesels in the UK and the
corresponding drop in revenue?

Phil 156 V6 (unleaded)