FYI : I am at CA too. Fuel economy drop means chances of you failling emmision test is very high. Why ?Because you are running too rich. After a bunch of reading and fixing, here are the parts I replaced in order to bump fuel economy from 15mpg to 19mpg (NA is my DD, 70% HW and 30% city) 1) Both O2 sensors. 2) EGR control solenoid (not the EGR unit itself). 3) 2 fuel injectors. 4) 6 spark plugs Trouble shoot first before do any parts replacement because those parts are not cheap ! Email me if you need more help/info. P.S Sorry for any grammer errors.
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