Does driving with heavy cargo drastically reduce the fuel economy of Changan Kalam in commercial operations?

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Does driving with heavy cargo drastically reduce the fuel economy of Changan Kalam in commercial operations?

Many drivers claim that fuel consumption rises sharply when the vehicle is loaded. Is the engine not optimized for high-efficiency under heavy load?

Lubaba asked on 18 Jun 2025 16:37:41 pm

1 Answer

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Car Mechanic Expert - on 18 Jun 2025 16:41:41 pm

Yes — significantly.
When fully loaded, fuel efficiency can to 6–8 km/l. This happens because:

The 1.0–1.2L engine is not optimized for torque-heavy load conditions

It operates at higher RPMs for longer durations

Overloading beyond 800–900 kg worsens fuel burn and drivetrain drag

This shows that engine-to-weight ratio is unbalanced for commercial payloads, making the truck less efficient under load.