The problem can also come from very out-of-date information that may have, at one time, been factual but is no longer true. For example, unleaded E10 has The only way to compare LPG mileage vs petrol mileage accurately is using the identical make, model, year, engine and transmission, with the only difference being the fuel.
This removes all of the other petrol vs LPG gas car mileage LPG mileage variables including the human factor, like a light or heavy foot. We can do this using the info from the Green Vehicle Guide government website. Ford Falcon LPG fuel economy consumption was The numbers are from these otherwise duplicate Ford Falcon vehicles in the same make, model, engine and transmission, with the only difference being the LPG conversion.
The numbers in these otherwise duplicate vehicles are 9. When considering LPG vs petrol gas or gasoline performance, many years ago the loss of performance, compared to petrol, had some basis in fact. Now, LPG vs petrol performance is equal to or better than that of petrol in many vehicles. An LPG car with a state-of-the-art liquid LPG system produces at least the same amount of power when running on auto LPG propane , as compared with petrol gasoline performance.
Your new car warranty remains intact unless the LPG conversion autogas conversion directly causes the problem. LPG conversion systems are so reliable that more than 1 million LPG conversion systems have been factory fitted by automobile manufacturers around the world.
The manufacturers of LPG conversion systems some call them kits are so confident that they offer extended warranties on their LPG cars. Changeover switch 8. Manifold nozzle 9. Water temperature sensor Gas temperature sensor Multivalve Tank Filler Vapour filter. This type of system is the simplest type of LPG conversion carried out. Suitable for all types of vehicle built before except those with a plastic inlet manifold , the system introduces gas to the engine in vapour form through the inlet manifold.
When switched to gas, the way the engine runs is controlled by the LPG system. Older, carburettor vehicles and early, injection models that do not have a catalytic convertor can be converted to an open-loop system where the LPG reducer and power valve are used to control the inlet of fuel into the engine. This is the simplest and cheapest solution.
However, with the addition of a lambda probe in the exhaust, the system can be upgraded to closed-loop operation, with all of the benefits described below. Later petrol-injected vehicles have catalytic converters and require LPG systems that use a slightly more sophisticated management system that reads the oxygen sensor in the exhaust. This then controls fuelling using a stepper motor, to give the most efficient fuelling at all times, resulting in better fuel economy and better throttle response.
Diesel engines can be converted to run partly on LPG, partly on diesel. Since the diesel engine has no spark plugs, the only way the LPG can burn is if diesel is used to ignite it. So diesel is always used. The addition of LPG gives a more complete burn of the diesel and can result in a reduction in the amount of black smoke emitted from the exhaust, which is often associated with diesels.
LPG also goes by its commercial name, Autogas. When you run out of LPG, the car will switch back to petrol automatically. The conversion takes around three days to complete. Some cars make more sense to convert to LPG than others… That means it would take 40 months or just over three years to pay back the initial installation cost.
A full toroidal LPG tank. Combine that with a full tank of petrol and you could well see miles between fill-ups. LPG conversion pros and cons Although LPG seems like a great money-saving solution, there are plenty of pros and cons to weigh up. Check out some of our other guides to find out more.
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