Fuel Injector Pressure Regulator

Do anyone know where and what the fuel pressure regulator is located and what it looks like? I am only getting 270 miles on a fuel tank of gas. Most of the driving is highway driving. I changed the oxygen sensors and the egr valve according to the check engine light. The check engine light is not on, but this car is guzzing gas. According to the math I am only getting an average of 24 miles per gallon. I know I should be getting more than that. I have a 1998 Eclispse gs with the 2.0 non-turbo. If anyone has the solution, please help me out.

Thats good gas milege man. Usually its worst with most people. If you want you might wanna change your air filter, spark plugs, wires and it might help a little. When you buy the car its says that it get like 29 mpg but its less then that since they kinda lie to you.

Thanks I have changed the wires and the spark plugs, I have not yet changed the air filter, I will do that this week.