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Possible reasons why a GMC Sierra (2014–>) consumes a lot of fuel:

1. Engine and driving style

Large V6/V8 engines naturally have high fuel consumption.

Frequent acceleration, heavy loads, or mostly city driving increase it further.

2. Tires

Incorrect tire pressure → higher rolling resistance.

Worn or unbalanced tires also raise fuel use.

3. Engine condition

Dirty air filter or clogged fuel injectors.

Worn spark plugs or ignition issues.

Faulty O2 sensors (lambda) cause wrong fuel-air mix.

4. Fuel system

Weak fuel pump or clogged fuel filter.

Malfunctioning MAF sensor (airflow meter).

5. Exhaust system

Clogged catalytic converter increases resistance and consumption.

6. Weight and aerodynamics

Roof racks, trailers, oversized wheels, or extra equipment increase drag and weight.

7. Software/ECU

Faulty or outdated engine control software may reduce efficiency.

First steps: check tire pressure, replace air filter and spark plugs if old, and scan for OBD2 fault codes.