The 2004 Nissan Sentra is available in four trim levels – the 1.8, the 1.8 S, the 2.5 S and the SE-R – with renovated front and back styling for 2004. This is Nissan’s most compact car, with excellent gas mileage and a decent list of standard equipment. The 1.8 and the 1.8 S feature a 126 horsepower 1.8-liter inline 4-cylinder engine with either a 5-speed manual transmission with overdrive or a 4-speed automatic. The 2.5 S and the SE-R feature an additional 39 horsepower (165 to be exact) from a 2.5-liter inline 4-cylinder. EPA estimates fall in the 28 City/ 35 Highway range.