Have you had any loss in power ? The gas injection systems are far more advanced than the previous mixer gas setups, but are also significantly newer and more expensive. Going with the injection system is the best solution for modern day cars, as it doesn't cause a significant performance or efficiency loss, and is generally more reliable. Essentially, the old-style system mixes gas with air through the air intake and basically "tricks" the ECU into thinking it is still injecting and running the engine normally off petrol. The gas injection system basically replicates the existing petrol injection system and uses its own ECU and sensor hook-ups, thus the reason for the significantly higher cost. You will also probably void your warranty (if you have one). As was mentioned by Rocketeer1 however, do remember that the properties of gas make it quite harsh on engines that are not specifically designed for it. In addition to using thicker oil, keep in mind that gas also has very little lubrication properties and can therefore cause some damage to valve seats and other internal engine components. Generally there are additives that are supposed to keep this at bay, but you would have to check this with a qualified installer. This is just some general information I found when considering a conversion myself, but I personally decided against it due to the increased wear-and-tear factors and high costs. Also not a major fan of having a compressed tank of gas behind me or losing boot space or my spare tyre. The best places to go and find the advantages and disadvantages would be a reputable gas installer and a good mechanic. The system I have has its own injectors and the 'gas' ECU piggybacks off the main ECU, as for harshness I disagree, gas does not create carbon deposits, carbon creates wear and dilutes oil, the aurion engine is all alloy thereby has stainless inserts fitted to the head this negates the need for an upper cylinder lube kit. Yes i have lost boot space but only at the back of the seat, my spare tyre is still in the same position, as for a tank it has built in safety valves. There is a newer system liquid injection that is around $1500 more, has better economy and claimed increase in horsepower due to the fact of liquid gas is injected into the combustion cylinder creating colder denser air for combustion.