My 2c worth.
We have had 3 lpg vehicles, A 1976 (20 years old) 5.0 statesman which I had converted and used to do the commute from the gong to sydney for 3 years, 150,000k's later traded in. A 1998 prado which was converted by the previous owner 12 months before we bought it and I sold last year for my defender. And a 2003 prado with the gas injection that we had converted after we bought it in 2006 and have just sold it for a burb delivery multivan(3.9(due sept) kids needed more space).
On the statesman it used around 20l / 100k's and cost the same as my old camry to run to sydney(excluding servicing).
The 98 prado had the same type of gas system and would backfire(it had a stretch rubber sock on intake fitted to absorb this) if it was running to rich. In a toy this causes the air filter box to open and then the sensors will not let you start the car. This was using about 17-20l/100k's.
The 03 prado had the 4.0 v6 and the gas injection this used 15-16l/100k's and you could not tell the difference between lpg and premium.
My original lpg mech. who was to honest for his own good said basically using any type of fuel lube on a car built for unleaded was a waste of $$ as the older type engines needed the lead as a luberication for the valves whereas the new engines valves where designed to operate with no lube from the fuel. The oil in an lpg car should be cleaner as you dont get any residue left behind but if you have just converted the soot my be crap burnt off the inside of the cylinder left behind by bad fuel or a bad set of rings allowing to much oil into combustion chamber.One other thing is after 10 years in NSW all gas tanks must be pressure tested.
The gas injection was literally light years ahead of the old systems and I would recomend it to anyone with a petrol car who does more than 15k's per year. This cost us about $4k with the 2500 back from the govt it paid for itself in 1 year(we did 90,000k's during the time we owned it so figure the savings at around $9000+ over 3 years compared to a straight petrol).
One final point in favour of LPG is that you CANNOT get a bad batch of gas as compared to diesel/petrol!Having said that both our cars are now diesel!
P.s ford went the cheap and nasty on their lpg cars(how the hell does a ford get 20l/100 when my 2.1ton prado could do 15???) fitting the cheapest old style system so that it was basically "free" with the Govt. rebate whereas holden went the injection system which is much better, much more economical and safer but costs around $2k more so ford gets more sales due to most being company cars whose purchase decisions are made by BMW 318i driving acountants.
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) fitting the cheapest old style system so that it was basically "free" with the Govt. rebate whereas holden went the injection system which is much better, much more economical and safer but costs around $2k more so ford gets more sales due to most being company cars whose purchase decisions are made by BMW 318i driving acountants.

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