Why Your CNG Car Mileage Is Dropping – 4 Practical Fixes

If your CNG car is giving lower mileage than before, don’t assume the engine is failing. In many cases, poor maintenance or driving habits are the real reason. Here are four simple checks that can help improve fuel efficiency. 1. Service and Tune the CNG System A poorly tuned CNG kit or a minor gas leak can increase fuel consumption. Get the CNG system inspected and calibrated at regular service intervals. 2. Keep the Air Filter Clean A clogged air filter restricts airflow, forcing the engine to work harder and consume more CNG. Inspect it during every service and replace it if necessary. 3. Check the Spark Plugs Worn or incorrect spark plugs can cause incomplete combustion, reducing power and mileage. Always use the manufacturer-recommended spark plugs and replace them as scheduled. 4. Drive Smoothly Aggressive acceleration, hard braking, and driving in the wrong gear can significantly reduce CNG mileage. Maintain steady speeds, shift gears at the right time, and avoid unnecessary idling. AMPYAN Expert Tip If your CNG mileage suddenly drops, also inspect: * Tyre pressure * Wheel alignment * Engine oil condition * Fuel quality * Oxygen sensor and engine diagnostic trouble codes (if the check engine light is on) Final Take Most CNG mileage problems can be solved without expensive repairs. Regular maintenance, clean filters, healthy ignition components, and smooth driving habits can improve fuel economy while helping your engine last longer. AMPYAN Verdict: Diagnose the cause before replacing parts. A systematic inspection saves both fuel and money.