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But some expectations of fuel savings have been tempered with experience.

"It could mean $3 to $5 billion in fuel savings over 15 years."

Test flights confirmed a fuel saving and range increase of 4-5%.

An average fuel savings of 10% is possible by just cruising.

This is where most of the fuel savings are recognized.

They also reduce airport noise, he said, and will result in fuel savings of 40 percent.

A major selling point of these systems was fuel savings.

The aircraft will deliver fuel savings of up to 15%.

In tests, this has been shown to produce significant fuel savings.

A new survey shows that fuel savings of up to £250 per year are possible by shopping around.