This 2006 Mercedes-Benz S 350 W221 has a 3.5-litre petrol engine and was tested on the dyno using both petrol and LPG. It produced 260 hp and 318 Nm on petrol, compared with 235 hp and 290 Nm on LPG — a difference of 25 hp and 28 Nm.

The inspection found that the installed LPG reducer was rated for around 200 hp, which is undersized for this engine. The video notes that the gas injectors were in good condition, but a higher-capacity reducer could reduce the gap between the two fuel results. The video does not confirm that the reducer was replaced.