What does “dual fuel” mean?

Dual fuel, also known as “mixed fuel”, can be defined as the simultaneous combustion of two fuels. In the case of APG’s Dual Fuel Technology, natural gas is seamlessly introduced into the induction system of a diesel engine. After conversion, the engine can operate on either 100% diesel fuel or on a mixture of diesel fuel and natural gas. At no time is the engine able to operate on natural gas exclusively.