WATCH: Can an engine use both petrol and diesel fuel?

You're probably aware of the dangers of mixing petrol and diesel when filling-up your tank but did you know there exists a type of engine that uses both fuel types?

The guys at  Engineering Explained have created an awesome video detailing how a Reactivity Controlled Compression Ignition (RCCI) uses two fuel types to create a more efficient engine.

Engineering Explained: "Reactivity Controlled Compression Ignition (RCCI) is a style of combustion that uses two different fuels and results in a super efficient engine. Thermal efficiencies as high as about 60% have been found in lab testing, which is remarkable for internal combustion engines. 

"Combustion relies on a low reactivity fuel (in this case petrol, though ethanol and natural gas can also be used) in combination with a high reactivity fuel (in this case diesel fuel). The engine benefits from the individual advantages of each fuel, resulting in exceptional efficiency and significantly less harmful emissions."