my all stock '87 22re is getting about 15 mpg. when the mileage dropped i replaced the injectors, feul filter and timing chain....past experience says it should get 20+ mpg. does anyone have any ideas what could be driving down my mileage?

 

i'd pull the efi fuse to reset the computer, and then let it relearn the fuel timing curves.

 

have you checked the O2 sensor. sudden drops in gas milage on fuel injected vehicles usually are caused by bad O2 sensors

 

last time its had a tune up ? maybe you didint set the timing right

 

def sounds like O2 but i still wouldn't expect that much of a gain.

 

i've seen O2 sensors cost you 50% of your gas milage

 

winter gas too, i get sh**ty gas mileage now, like 15MPG on a 3.4, but 20 during the summer