diesel is more efficient
A car has to be fuel efficient. It means it has to completely burn the fuel.
No
Kick it
A car will make traveling and commuting more convenient and efficient.
there is no accesory for that
It's a more efficient fuel.
Yes and No. It is more efficient then a conventional gas powered system, but still has a long way to go in terms of being real efficient.
A tram is more efficient because it doesn't release lethal gases which go up to the atmosphere and tram uses electricity
The Mazda Miata is very fuel efficent.
It has made the car production line more efficient, fast, and green.
A streamlined car would be more efficient than the same car without streamlining as it would present less drag. Unfortunately, streamlining by itself does not make a car efficient. Efficiency is the product of may different things such as the type of and inflation of the tires, the size and efficiency of the engine and etc.