my car has emissions equipment for CA cars. what will cause bad gas mileage? on 2007 Toyota Camry

Gas mileage expectations?

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2 answers
if its a fuel issue the ck eng light should be on, scan codes and post so we can adv. auto zone will scan for free
What driving coditions? More stop and go , or mostly highway? Probably can expect anywhere from 23-38 MPG. What's the milage on engine and what kind of maint. been done ? If plugs have been replaced and they are not correct that can affect the fuel economy a lot.