London is experimenting with coffee as a diesel fuel for its buses. This is a biofuel created by blending oil extracted from coffee waste with diesel. Biofuel from different waste products - such as cooking oil and tallow from meat processing - is already used in many of the capital's 9,500 buses. Buses can be powered using the fuel without the need for modification.
It would take just over 2.55 million cups of coffee to create the enough biofuel to run a London bus for a year once the oil has been blended with diesel.
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