1 used to describe engines or machines that do not use much fuel in relation to similar engines or machines:
In addition, the yearly road tax is based on the value of the car, implying relatively higher taxes for newer, more fuel-efficient, cars.
They are not financially able to buy the latest and most fuel-efficient cars to overcome the effect of extra fuel duty.
It would be helpful if we could find ways of encouraging people to exchange old and polluting cars for newer, more fuel-efficient cars.
Such improvements will depend on motorists' demands for more fuel-efficient vehicles and on the ability of manufacturers to respond.
There should be a differential tax system that would encourage people to use fuel-efficient vehicles.
The excise duty on road fuels already encourage motorists to buy more fuel-efficient cars.
That is necessary if the airline is to have a modern and fuel-efficient fleet which can compete with other world airlines.
They have managed to bring into service more fuel-efficient aircraft.
