The eighth-generation Volkswagen Golf has been equipped with an updated example of the brand’s natural gas engine. Using the TGI moniker, the latest addition to the range offers lower running costs and a lower carbon footprint.

The TGI powers the group’s turbocharged 1,5-litre four-cylinder petrol engine via the Miller cycle principle which achieves low carbon emissions via a high efficiency and a compression ratio of 12,5:1. Joining this is a turbocharger with variable turbine geometry which increases the charge pressure and supplies more air into the cylinders, giving the hatch more power at low engine speeds.

In many countries, the cost of natural gas is comparatively lower than petroleum which makes it somewhat of a logical alternative. The total CNG tank capacity of the TGI measures in at 115 litres which equates to 17,3 kg. When full, it allows for a range of 400 km based on the WLTP cycle. Should you run out of gas, a 9,0-litre petrol tank acts as a reserve.

With this system, the TGI achieves a claimed gas consumption of 4,3-4,1 kg/100 km and a CO2 emission figure of 117-111 g/km. With natural gas, the TGI produces 25 per cent fewer carbon emissions than its petrol-powered counterpart.