Which is more fuel-efficient, 'l' or 't'?

[ZacharyDella]

Generally speaking, for engines of the same displacement, turbocharged engines are more fuel-efficient than naturally aspirated engines, meaning that choosing 't' over 'l' when buying a car will save more fuel. Below are the structure and common faults of turbochargers: Structure of a turbocharger: The turbocharging system in gasoline engines consists of two main parts: the turbocharger and the intercooler. The turbocharger compresses the air, and the intercooler cools the compressed air. The turbocharger itself is composed of the turbine housing and the compressor. Common faults of turbochargers: Low boost pressure, which refers to the boost pressure being below 90% of the normal value compared to standard conditions. Low boost pressure reduces the charge in the cylinders, leading not only to a decrease in diesel engine power but also to a deterioration of the combustion process inside the cylinders, resulting in increased fuel consumption and higher exhaust temperatures.