unanticipated rise in fuel costs.

But it was the 39 percent rise in jet fuel costs in the last month alone that pushed us to make this decision.

Fuel and fertilizer costs are up.

For even the very wise cannot see all ends.

What we are looking at is an occurrence that is similar to what we see in fossil fuel burning.

I wasn't really looking at it solely to save fuel costs, but the renderer who was picking up our dirty vegetable oil at the store told us he was going to start charging, so I decided to look into the car as a way to use our used cooking oil,