The combustion engines in gas-powered cars are pretty inefficient, because most of the energy they use — about 70 percent — ...

Combustion engines, the engines in gas-powered cars, only use a quarter of the fuel’s potential energy while the rest is lost ...

Researchers design and test a waste-heat recovery system, illustrated here, that attaches to a car tailpipe and converts heat from exhaust into energy. The fanned grooves on the outside of the pipe ...

Combustion engines only use a quarter of the fuel’s potential energy while the rest is lost as heat through exhaust. Now, a ...