The company did not do so because it felt no pressure to create a cleaner fuel.

In that way, the development of these clean fuels is given a fair chance.

The package of measures proposed tonight will give us cleaner fuel.

But government can make a difference in the economic pull toward clean fuels and the environmental push.

However, they're still trying to figure out how to use the cleanest fuel of all - the air we breathe.

This is a clean fuel, converted from coal by a chemical process.

Other states and municipalities also have their own requirements for cleaner fuel.

I believe these vehicles must be required to use clean fuel, too, if we want to cut particle emissions.

Improvements to car standards and cleaner fuels are a necessity.

In fact, it could be the ultimate clean fuel.