But the combustion point of heavier fuels can be very high.

All these speeds are reached with more than 20% lower consumption of heavy fuel.

I added, "Plus we're burning all that heavy fuel."

The speed with which a forest fire can spread in heavy fuels under the most hazardous conditions is well illustrated by this fire.

The oil crisis particularly affected International's working trucks, which were the heaviest and least fuel efficient in the market.

This is not heavy fuel or 'bunker' oil.

The ship was fuelled by heavy fuel which is a produced in the refinery.

"It's not as bad as heavy fuel, but it can still make a mess," he said.

The engine now used heavier fuels such as kerosine and fuel oil.

The Erika broke in two, spilling 10,000 to 12,000 tons of heavy fuel into the sea.