With the rise of gas prices and my car not gettign any better mileage its becoming very annoying... I have replaced fuel filter, spark plugs, wires, air filter, Oil filter with change of oil,and thermostat Is there anything else i should be changing? Also is this normal i shut the car off and i go to relive the fuel pressure and theres nothing there?

Holy jeez, fuel pressure regulator. It'* letting your pressure leak down. With the car idling, pull the vacuum line off the FPR. Any fuel or really strong fumes?

You didn't mention O2? That'* the prime suspect.

Edit....one other thing. If you're running that rich, your plugs are fouled again. And your cat may be toast.

I haven't changed my oxygen sensor ever.

Car has 117K and still gets the same mileage as when it was new.

Yours is a rare case. Most are starting to get tired at 60-75k.

Probably the crappy California gas,

Sorry lol most important thing and forgot to mention. I have a brand new 02 sensor lol sorry. so a FPR would be my next choice in tackling mileage?

FPR only if the fuel is leaking back into the vacuum line.

And what brand is your O2 sensor?

got it from gmpartsdirect so Acdelco? if it was a problem with a bad fpr what would be some signs to look for?

Fuel leaking into the vacuum line.

(for the third time)