Biofuels are not a new thing but scientists are still in the process of discovering which could produce more biofuel. Sure, oily plant products can be used but coffee works better apparently.
Coffee as biofuel would surely make the car smell good. It takes only 5 to 7 kilograms of coffee grounds to produce a liter of biofuel which could cost about $1 only.
Used coffee grounds can be made into biofuel through the process of ‘transesterification’. If this goes mainstream, the world will become a better-smelling place. You know, streets would soon smell like Starbucks.