Researchers have developed an organic capsule called the Mileage per Gallon Capsule (MPG-CAPS) that improves fuel efficiency and reduces emissions from vehicles. The capsule increases combustion speed by up to four times, boosts engine performance, and reduces exhaust temperatures while saving up to 14% of fuel. It has been approved for use in the Central African Republic where it can help reduce fuel costs and emissions. The capsule is dropped into the fuel tank before filling and works for both petrol and diesel vehicles.