Where did you research this information? Some of those points defy the logic of physics...
1. LPG will cause a power and efficiency loss due to the lower density of the gas. LPG has a higher octane rating, which compensates for the lighter density and brings performance to a comparable point to petrol. The loss of efficiency still exists however and means that in a car that would typically make 10L/100km of petrol, will be closer to 15L/100k running on gas. This is going to be the case with comparing ANY gaseous fuel to a liquid fuel and is a scientific fact that cannot be debated.
2. Engine wear - this is a point to be argued. UNLESS additives are used in the gas to provide additional lubrication of which gas by itself lacks, valve seat wear WILL INCREASE. There is negligible impact to cylinder walls and rings. However, this may be compensated IF the engine is designed to run with gas (the Aurion is NOT designed to run with gas), which in that case will have compatible alloys and internal designs to be able to handle the significant reduction in lubrication. If you wander around wreckers and take a look at almost any car that has a gas system, you will find that the head is not in very good condition and will require either valve seat replacement and/or entire valve replacement. LPG does not have any lubrication at all by itself.
3. This is true for the most part, but is quickly compensated by the fact that additional tuning and maintenance is required in order to ensure the gas system is safe. This includes regular checks of emergency cutoff valves and testing of all fittings to ensure there are no leaks. In older systems that used an air intake mixer - this would also include replacement of diaphragm parts at regular intervals to ensure correct mixture. This is not the case with injection systems, although they must still be tuned on occasion to compensate for any variances introduced by various qualities of gas. Also note - the government has plans in the very near future to introduce additional excise tax to gas (approximately 60c/l has been suggested!), which will very, very quickly make any additional gains very minimal.
4. Yes this is true - only the old-style mixer systems had this issue due to incorrect mixtures from lack of tuning. Injected systems do not have this issue as an ECU is used.
Do not believe everything gas fitters say, as they are all out there trying to make an easy sale!
I believe anyone who wants to do LPG conversion needs to find information LATER THAN 2006. Since the late SVI and the coming up liquid injection systems are another class than the old mixers. so that's why people have two extremes in opinion depends on what system you are talking about.
the new liquid injection is claiming a better performance and higher fuel economy than ULP. however i'll only come out 6~9months later. The SVI system is also claiming to have reduced the power/fuel economy to the minimum compared to ULP.
so I would recommend LPG to someone who really wants to save $$ on fuel. However, a good installer is EXTREMELY important to save future hassle.
