Operating an LNG truck requires not only technical skill but, more importantly, a deep understanding of the vehicle’s specific characteristics. Many drivers, by adhering to old habits or falling into common misconceptions during operation, not only increase fuel consumption but also create potential safety hazards.
Below, we outline several key operational misconceptions to help you drive more smoothly, economically, and safely.
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Believing that coasting in neutral saves more fuel
Many drivers are accustomed to shifting into neutral and coasting while driving, under the impression that this conserves fuel. In reality, most modern LNG trucks are equipped with electronically controlled engines that feature a “fuel cut-off on deceleration” function.
When coasting *in gear*, the system can automatically cut off the fuel supply—a method that actually proves more fuel-efficient than coasting in neutral. This fuel-saving effect is particularly pronounced when driving steadily in the highest gear at low RPMs.
Tip: For vehicles with automatic transmissions, coasting in neutral is strictly prohibited; doing so compromises not only fuel economy but, more importantly, driving safety.
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Driving a Gas-Powered Vehicle Like a Diesel One
Drivers transitioning from diesel trucks to LNG trucks often retain the habit of “heavy acceleration and low-RPM shifting,” which leads to high fuel consumption and poor power response.
Since LNG engines utilize electronic ignition and exhibit weaker low-RPM torque, it is recommended to shift gears within the 1200–1500 RPM range. Furthermore, drivers should adopt a driving rhythm characterized by “gradual acceleration and light throttle application” to avoid sudden bursts of speed.
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Excessive Pursuit of Fuel Savings That Harms the Vehicle
In an effort to conserve fuel, some drivers resort to unscientific practices—such as the improper use or deactivation of retarders, which compromises auxiliary braking effectiveness; or the frequent switching off and restarting of the engine, which actually results in increased fuel consumption and accelerated component wear.
Tip: For brief stops (e.g., waiting at a red light), shift into Neutral (N) gear; reserve engine shutdown for longer parking periods.
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Driving Aggressively Immediately After a Cold Start
In low-temperature environments, LNG engines rely on the engine coolant temperature to ensure the complete vaporization of liquid natural gas. If the vehicle is driven at high speeds immediately after starting, the fuel atomization will be insufficient, leading to reduced combustion efficiency and increased fuel consumption.
Recommendation: After a cold start, allow the engine to idle and warm up for approximately 5 minutes. Wait until the coolant temperature rises above 60°C before driving; during the initial phase, keep the engine speed below 1400 RPM and the vehicle speed below 20 km/h.
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Neglecting Maintenance Details
LNG vehicles have specific maintenance requirements, such as:
(1) Regularly checking to ensure the gas leak alarm is functioning properly;
(2) Carrying a supply of soapy water on board for simple leak detection;
(3) Monitoring for ice formation on the gas cylinder valves;
(4) Avoiding direct water rinsing of the engine to prevent electrical short circuits.
Furthermore, prior to extended periods of inactivity, you should first close the gas cylinder’s liquid outlet valve—allowing the engine to shut down naturally—and periodically clean the gas supply system filters and heating water lines.
Only by mastering scientific driving techniques and understanding the vehicle’s specific characteristics and requirements can you ensure a balance of efficiency, economy, and safety in every transport operation. May every truck driver achieve perfect synergy with their LNG trucks, ensuring a steady and successful journey ahead.
