2009
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1.8-Liter, 16-Valve SOHC i-VTEC® Engine
The GX engine achieves 24 mpg GGE city and 36 mpg GGE highway/ 28 GGE combined (Gasoline Gallon Equivalent).* A host of sophisticated technologies include special engine mounts, crankshaft, engine block, pistons and connecting rods to help achieve remarkable smoothness.

*Based on 2009 EPA mileage estimates, reflecting new EPA fuel economy methods beginning with 2008 models. Use for comparison purposes only. Do not compare to models before 2008. Your actual mileage will vary depending on how you drive and maintain your vehicle.
5-Speed Automatic Transmission
This electronically controlled 5-speed automatic transmission* offers more gear ratios for quick acceleration and enhanced fuel economy. You get more power, smoother upshifts and downshifts and quieter operation.

*24 city/36 highway/28 combined mpg in Gasoline Gallon Equivalent (GGE), automatic transmission models. Based on 2009 EPA mileage estimates, reflecting new EPA fuel economy methods beginning with 2008 models. Use for comparison purposes only. Do not compare to models before 2008. Your actual mileage will vary depending on how you drive and maintain your vehicle.
Drive-by-Wire™ Throttle System
This system consists of an electronic position sensor connected to the accelerator pedal that sends a signal to the vehicle’s electronic control unit (ECU). The ECU combines the accelerator-position signal from the driver with data such as engine rpm, coolant temperature and road speed, and then determines the optimum position for the throttle plate. It then sends a signal to the Drive-by-Wire™ driver unit that electronically operates a stepper motor on the throttle body. The stepper motor opens and closes the throttle to the exact position necessary for proper engine response.
Advanced Technology Partial Zero-Emission Vehicle (AT-PZEV)*
To achieve Advanced Technology Partial Zero-Emission Vehicle (AT-PZEV)* status, a vehicle must be a Super-Ultra-Low-Emission Vehicle (SULEV) with zero evaporative emissions and carry a 15-year/150,000-mile warranty on emission equipment.

*AT-PZEV (Advanced Technology Partial Zero-Emission Vehicle), as certified by California Air Resources Board (CARB) in California and states that have adopted California Zero-Emission Vehicle regulations.

In states that have adopted the California PZEV warranty requirements.
CNG
The compressed natural-gas (CNG) fuel tank is almost as impressive as the engine. The tank is lightweight, strong and built for safety. And for extra peace of mind, we’ve equipped the tank with an in-tank solenoid valve that will cut off the flow of gas if the system is compromised, or when the engine is turned off.
Flat Floor
Much of the increased legroom comes from the rear suspension’s highly compact design, which frees up more space for passengers and cargo. Along with a compact exhaust system, this makes it possible to seat five people in the GX and to eliminate the floor hump for a roomy, flat rear-floor area.