The costs on this list aren't really hidden costs of LPG conversion, because quality installers will tell you all this before you convert your car to LPG, but nevertheles it is advisable to consider them beforehand.Still using petrol
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LPG converted engines usually run on petrol when they are colder and switch to LPG when they are warm enough (at around 35 – 40°C). That is why the car will run on petrol longer in colder conditions. A thing to consider if you have a lot of short routes on which the engine doesn’t have enough time to warm up.
Although LPG has a higher octane rating (up to 110+) than petrol (90 – 100) and higher energy value (46,1 MJ/kg) than petrol (43,5 MJ/kg) it still has lower energy density because of the lower liquid density (0,5 – 0,58). Petrol has 0,71 – 0,77.
That is why the consumption (liters per 100 kilometers) is always higher with autogas compared to petrol. On average there is a 20% increase in consumption, but it depends a lot on different factors, so it can be lower or higher.
Autogas systems have servicing intervals at about 20.000 kilometers or 1 year. Usually the mechanics check for any leakage, change the LPG filter and run a computer diagnostics. Because the costs can go from 20 to 100+€ some people don’t want to service the system until it is too late.