In reality 40 mW from a 50% efficient 25w fan gives 0.32% efficiency.

This plane had three different wing positions to give it maximum efficiency at all speeds.

The engine gives good fuel efficiency peaking at about 3500 seconds within the atmosphere.

Mass gave us efficiency and productivity, making us (some people) rich.

Combined with new locomotives, this would give increased efficiency in hauling the ore.

Increased fabric insulation to give the clubhouse better thermal retention and efficiency.

Plan everything to give time-saving efficiency, for you will need it - time is literally money in these circumstances.

Programmers around the world embrace C because it gives maximum control and efficiency to the programmer.

A heat engine gives greater efficiency when run with a large temperature difference.

The driver would have a microprocessor controlled throttle to give greatest efficiency.