The need to reduce environmental pollution has led to a search for alternative, low-emission fuels. In fact, internal combustion engines, are one of the main source of pollution in the urban environment. Methane is one of the best alternatives to the main and most common fossil fuels, because it is one of the fuels with the lowest CO2 and hydrocarbon emissions. In addition to being one of the cleanest fuels, it has remarkable chemical and physical properties, such as high anti-knocking, which would allow high efficiency in monovalent methane-fuelled heat engines with an high compression ratio. However, compared to petrol, methane burns slowly, which leads to a variation in efficiency and not complete stability cycle by cycle, reducing power and increasing fuel consumption.