human
I'm looking to buy a new car. What are the most fuel efficient options?
assistant
The most fuel efficient options for buying a new car include hybrids, electric vehicles, and cars with turbocharged engines. Hybrid models typically have better fuel economy than traditional gasoline-powered cars, while electric vehicles use electricity instead of fossil fuels to power their motors. Turbocharged engines can also improve fuel efficiency by increasing the engine's compression ratio, allowing more air into the combustion chamber, which results in more power and less fuel consumption.