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Sudden Drop in MPG

Steel Armadillo

Steel Armadillo

New member
Hey guys. I've got a 2003 with the 3100, just rolled over 190k. Its been well maintained oil/air filter/everything else at regular intervals. The only mods are an empty cat and SLIGHTLY upsized tire (very slight). The fuel filter was replaced maybe 15k ago.

Up until 3ish months ago I was getting consistent 420-425 miles to a tank. Now all of a sudden I'm getting 350-360 miles. No significant changes in driving habit.

Anyone have any ideas why?

I have tried (with no effect):
New air filter.
Seafoam in intake (not in fuel).
High-end gas in last two tanks.

Thanks,
-Jesse
 


Any CEL's?

Also...what about the weather? Has it gotten pretty cold recently? Because hotter weather = better MPG's
 
I didn't see the second question Nick, it has been blistering hot here since May (Central Florida). The last two weeks maybe it has been slightly more bearable.
 


I had a drastic drop in mileage too. Got er narrowed down to my upstream O2 sensor. May be the same issue on yours. Not sure if the 3100 runs an upstream and downstream O2 setup or just a single. But its definitely something to look into.
 
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