Sudden MPG Drop

[tizom34]

Hi Guys & Gals,

I have a 2002 SE with 210,000 miles and have owned it since it had 50,000 miles on it. This car has always always always averaged 28-30mpg. However, about 6 months ago every tank began averaging 18-20mpg, hand calculated of course, and continues to be that way. Car is throwing no codes, I have checked MAP, MAF, EGR, and plugs and wires were replaced at 200,000, and everything appears to be up to snuff. For the most part the car runs as normal; the only non-normal indication is that under slightly harder than normal acceleration from a rolling start it will bog down slightly. I am looking for any advice on what you think may be causing this?

Thanks

[redzmonte]

Tuneup items (plugs, wires ect)
Dirty MAF
Vac Leak

are the things i would investigate 1st. do you have a scanner of any sort? your LTFT's will tell you alot, should see +/- 2-3%.. anything over that will indicate a issue.

[00Beast]

Almost sounds like a plugged cat...

[nos4blood70]

Almost sounds like a plugged cat...

That's what I was gonna say.

[mdrew]

maybe clogged fuel injectors or fuel filter. I guess that could be covered in the above "tune up items"

[tizom34]

Alright thanks guys I'm gonna check out all of the above

[skregal]

Check your tire pressure. The warning won't come on the dash
if they are all around the same lowness (word?) in pressure.

That shouldn't have happened suddenly however, unless a huge weather change
or something.