LPG generations 1–6: which one to choose in 2026

When people say “LPG generation”, they mean how the gas reaches the engine and how precisely the system meters it. The higher the generation, the more accurate the dosing, the smoother the engine runs and the more honest the consumption. Let’s go through them in order — without unnecessary theory.

1st and 2nd generation — the old classics

These are vacuum systems with a mixer: gas enters the intake mechanically. Simple and cheap, but imprecise. Today they are rarely fitted, only to older carburettor and single-point-injection cars. They are not suitable for modern vehicles.

3rd generation — a transitional solution

Distributed gas supply, but with slow control from a single point. An in-between option that the 4th generation has almost entirely replaced.

4th generation — the standard for most cars

Distributed sequential injection: each cylinder has its own gas injector, and the control unit synchronises delivery with the factory petrol injectors. The engine runs as smoothly as on petrol, gas consumption is accurate and switching between petrol and gas is seamless. This is the optimal choice for the vast majority of petrol cars with electronic injection — which is why we install the 4th generation most often.

5th generation — liquid-phase gas

Here the gas is delivered as a liquid rather than vapour. The technology is more complex and more expensive, offers no real advantage for the everyday driver, and so is rarely used in mass installation.

6th generation — for direct injection (GDI / TSI / FSI)

Modern turbo engines with direct petrol injection need a dedicated solution. The 6th generation delivers gas in liquid phase and works alongside the factory system, protecting the petrol injectors from overheating while running on gas. If you have a GDI, TSI, FSI or turbo engine, this is your option. Read more in the article on LPG for turbo and direct-injection engines.

So which generation should you choose?

The answer is almost always determined by the engine type:

• Ordinary port-injection petrol engine → 4th generation.
• Direct injection, turbo (GDI/TSI/FSI) → 6th generation.

We give an exact recommendation after inspecting the car. From the 4th generation onward, gas systems have at least two safety levels and automatic gas shut-off, so in terms of safety they are on par with the petrol system.

Want to estimate your savings in advance? Use the savings calculator, and check current installation prices on the prices page.