latly im barely getting 350 to the tank when 2-3 months ago i was getting 420-440. I hvae changed my sparks and fuel filter. I have an EGR code. Can the egr lower my fuel economy that much??? somtimes i get as low as 300 ona tank.

 

Did you make sure you install and tighten everything up right when you did the maintenance?

 

ya everything is tight ( also ran injector cleaner.

 

Check your air filters.
Dirty air filters can cause a major cutdown on MPGs.
My friend experienced a serious drop in his gas milage, and when he checked his filters he found, no joke, a pigeon.

 

nah my air filter is only 3 months old its clean.

 

Assuming it doesn't have a hidden knock sensor code, yeah, egr could cause fuel efficiency issues, more so if it's a high flow malfunction I think, I dunno, I don't really feel like thinking about it to much right now, but def. clean ur guide toob

 

Mine always goes to hell this time of year or if I steer away from Shell.

 

be happy for that people, like me, pull 280 on lucky weeks. lol

but to answer ur question, clean ur throttle body also!

 

Wait what car does he drive? I hope not a Maxima.