Category Archives: CNG Blog

CNG Conversion Fuel Mileage

Paratransit Van

CNG Fuel Mileage and Vehicle Performance

Fuel Mileage and Vehicle Performance have every thing to do with the BTUs in the fuel, the Technology built into the CNG Conversion System, and the CNG Kit Installer.

BTUs:  Natural gas carries higher BTU levels than gasoline due to ethanol and oxygenated fuel additives in the gasoline.

The energy content of liquid fuels like gasoline and diesel is dependent on the season and oxygenated fuel additives that reduce emissions. A summer gallon of gasoline will typically contain 114,500 British Thermal Units (BTUs), while a winter gallon has 112,500 BTUs. Blends with 10% ethanol and reformulations with MTBE both have fewer BTUs than pure gasoline. Summer blends for MTBE contain 112,000 and 10% ethanol blends only 110,210 BTUs (112,210 BTU’s in winter). Natural gas has 114,000 BTUs. The clear winner and most expensive is diesel with 129,500 BTUs. Because fueling stations don’t have to advertise that they are using a 10% ethanol mix in their gasoline, most don’t; however, most stations dispense this mix. Ironically, this means that in the summer, vehicles running on CNG more than likely receive 3,790 more BTUs than running the vehicle on gasoline and CNG costs 40% less. As for dual-fuel CNG diesel conversions, the mixture of natural gas with air in the cylinders creates a denser and more explosive reaction after the diesel is injected. Versus CNG diesel conversion system delivers more power and saves approximately 35 % in fuel savings.

Technology: The air fuel mixture will to a large extent determine the efficiency of your vehicle. CNG Conversion Systems that can duplicate the OEM fuel map settings will provide the best fuel mileage.

CNG Kit Installer: Tuning the CNG Conversion System properly is essential for a successful installation. Technicians must be trained and certified in CNG fuel systems installation and maintenance through accredited CNG Conversion Schools to prevent damage to your vehicle’s engine. If the fuel mixture is off, the conversion can cause severe damage to the valves or catalytic converter. When installed and calibrated correctly, the majority admit to experiencing more pep and receiving substantially better mileage.