fuel efficiency

I think we should try to raise the fuel efficiency.

"None of them want anything significant to be done about fuel efficiency."

And wouldn't you rather be driving a car that had a higher fuel efficiency?

It has been a very successful product because of the fuel efficiency.

A 40% increase in fuel efficiency is an amazing result.

Fuel efficiency better than any engines available at the time.

The vote suggested strong support for more fuel efficiency in cars.

This change may give an improvement of up to 35% fuel efficiency.

What speed should I drive to get maximum fuel efficiency?

That's not the best way of improving fuel efficiency, but it's a lot better than doing nothing.