Anyone know common causes of sudden loss of gas mileage.
I'm talking about one week to the next. It wasn't gradual at all. I've been putting $20-$30 bucks every other day.

No new mods on the car. It's at 90K. Is it time for the spark plugs to be replaced?

Not throwing any codes as of yet, but I'm burning through gas like there's no tomorrow and I can't figure out why.

FYI, I did just clean my popcharger and reset my ecu, but it hasn't seemed to have helped.

Thoughts???

 

First guess would be O2 sensors.

Edit. The best thing to do would be to get the car scanned. Not just for codes but a full diagnostic.

 

Same thing happened to me after a trip to the track and my gas milage went from 17mpg to 14.8 mpg. I figured it was just my sparkplugs so I replaced the and I'm at 16mpg now.

 

Plugs should have been replaced at 60K

 

thanks for the help.
i haven't had any stalling or mis-firing, so i never bothered with the plugs.

i've seen all the threads, some say replace at 60K, some say they run til 100K, some say don't replace until your car tells you to (stalling or mis-firing)...

regardless, they're going to get done soon.