fuel

1 - We were only able to make a rough estimate of how much fuel would be required to go there.

2 - Researchers studied the environmental impact of the combustion of many fuel blends containing waste plastics and conventional combustibles like coal and lignite etc.

3 - Diesel engines are more efficient than gasoline engines owing to the fact that a larger proportion of the fuel used is burned.

4 - Coal, oil, gas, and the minerals supplying nuclear fuel are certainly abundant natural resources.

5 - Firewood is the chief fuel used for cooking and heating in many countries.