DX lowest of trim levels(no power window/locks/ac/radio/cruise control)LX step up(standard power windows/locks/ac/cruise/radio/single disc CD)GX similar to the LX but runs on Natural GasEX near the top of the line(all power/multi disc CD/ alloy wheels/ split folding rear seat/sunroof/audio controls on steering wheel)The fuel economy will be near the same for all trims. The GX just emits less pollutants than the rest. With less horsepower 113hp. The other models have 140hp till you get to the Si with 197hp. Performance wise the DX,LX and EX are all similar except the EX has four wheel disc brakes. They all have the same engine.