I know this is an old thread, and that I've already posted in it, but here is an update, since I've converted to LPG
Petrol tank is the stock tank, LPG is 80 Litre, fillable to about 62-64 Litres depending on temp.
I normally run
Petrol: BP/Caltex Premium 95 (only because most regular now contains ethanol, and I wont let that garbage near my car)
LPG: BP Autogas (Only cause they are one of the cheapest to begin with, and because I have an Autogas card for them, which gets me 2c/L off without having to by a **** thing)
If I drive normally,
~250ks to a tank of petrol
~400 to a tank of LPG
If I drive super economically
~300 to a tank of petrol
~470-500 to a tank of LPG
Now considering on average I spend ~$1.50/L on petrol and I spend ~$0.60/L on LPG, I think LPG on these vans is a clear winner.
Van is a 94 Mitsy Express 2.0L Carb Auto, with a vapour mixer system, with the mixer sitting directly on top of the carb.