You can count up 5.8 million BTUs (that's how many BTUs a barrel of oil yields) from a wood stove, or a diesel engine, or a microprocessor, or a laser.

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This design, ideal for city driving's stops and starts, allows the diesel engine to be shut off when the vehicle is stopped or decelerating.

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The physics of a spray dryer are like that of a diesel engine's fuel injector in that it atomizes liquid (insulin or gasoline) into droplets.

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Diesel derived from coffee is less thick and can usually be burned in an engine with little or no tinkering.

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