A few can stay together long enough to use as radioactive fuel.

If we can use air as fuel, why think about using anything else?

When the stuff is dry they use it as fuel.

Even peanut oil and butter could be used as fuel if necessary.

It can also be used as fuel, to make baskets, and many other things.

Eventually, people must have started looking for such black rocks in order to use them as fuel.

A kid who used his fear as fuel, the old manager said, would have a chance to become a contender.

It's also used as fuel to get us to and from jobs (where we make those products).

Even today there are cars which use wood gas as fuel.

This hydrogen would then be removed to use as fuel.