High Fuel Consumption in Hyundai Santro

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High Fuel Consumption in Hyundai Santro

Despite being a small hatchback, Santro owners often report a lower-than-expected fuel average, especially on CNG o r in city traffic. What factors commonly lead to increased fuel consumption in the Santro, and what steps can help restore better mileage?

Talha Kyanii asked on 03 Dec 2025 14:19:36 pm

1 Answer

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Talha Kyanii - on 03 Dec 2025 14:22:43 pm

Santro is known to be slightly fuel-heavy compared to Suzuki models, but excessive consumption usually has fixable causes.

Common Causes

Clogged fuel injectors
Santro is an EFI car and its injectors often get dirty with low-quality fuel.

Faulty O2 oxygen sensor
Causes the ECU to give too much fuel.

Old o r incorrect spark plugs
Affects combustion efficiency.

Weak fuel pump o r clogged fuel filter
Disturbs pressure and causes rich mixture.

Poor CNG tuning
Leads to bad average both on petrol and CNG.

How to Improve Mileage

Get injectors cleaned with proper EFI service.

Replace the O2 sensor if the check engine light appears.

Use correct NGK spark plugs recommended for Santro.

Clean o r replace the air filter regularly.

For CNG users: get proper computerized tuning to balance petrol + CNG setting.

Most owners see mileage improve to 11–13 km/l city after proper maintenance.