Do turbochargers improve fuel economy?

Compared to naturally aspirated engines, turbocharged ones can increase fuel efficiency by up to 10%. Also, turbochargers produce higher power than naturally aspirated engines. Moreover, turbocharged engines have better efficiency when driving with higher RPMs and heavy loads.

Which is better, supercharger or turbo?

Do you want immediate energy or fuel efficiency? Both chargers add varying levels and types of power. A supercharger uses fuel to get more power, but does it quickly and with more direct effect. The turbocharger powers the engine more slowly and at higher RPMs, but it adds strength while using less fuel.

Which is better, a turbo or non-turbo engine?

A turbocharged engine can give up to 20% improved fuel economy. It also gives better performance at high altitude. At high altitudes regular engines produce much less power due to the higher air pressure. On the other hand, at high altitudes, turbocharged engine performance and power generation improve.