Quote:
Originally Posted by RedShifter
I don't have any mods. Car has about 3,700 miles
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Hmm.
I say, fill up, use tripometer to calculate MPG on next fill up and take it from there.
You could have a failing O2 heater circuit and not get a CEL. A small break in the wire from a rock that flew up into the undercarriage can do it.
After that, all I can think of is over oiled filters if you have them, meaning you need to clean the MAF's or something really weird like a clogged cat.
Try confirming the MPG first and then we can go from there.
Any fluttering or low idle?