Gas (methane) is the best.
Advantages: greater heat capacity, easier transport, no solid wastes, no flying ash, easier extraction etc. But methane is more suitable as material for chemical industry not simply burned.
petrolem and coal
Coal is a fossil fuel. The major fossil fuels are natural gas, crude oil and coal.
gasoline, coal, gas and wood
gasoline, coal, gas and wood
Gas, Oil and Coal
yes it is
Coal is a solid, Natural gas is a gas and Oil is a liquid.
Coal, Oil, Natural gas. Coal first, Natural gas second, Oil third.
kerosene,coal,petrol,kether
Fossil fuels
Bio-fuel
I believe you mean coal bed gas or coal bed methane which is a fossil fuel.