ZX3 ,, sudden drop in gas mileage ?? - Focus Fanatics
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Old 08-16-2011, 07:22 AM   #1
Esteban
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Join Date: Mar 2008
Fan#: 54267
Location: Overthere, FL
What I Drive: 03 ZX3 5spd

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ZX3 ,, sudden drop in gas mileage ??

I am mechanically inclined & have always kept my vehicles in great shape. I am older , so I drive like a Grandpa, & don't have any bad habits that affect mpg. No hills, [ Fl. ] , but A/C on a lot.
My 2003 ZX3, Zetec , 5 spd. , 52,000 miles , always got around 35 mpg [ combined ]. Then came 10% ethanol in gas & it dropped it to 32-33. The last 2 tankfuls I have seen it drop to 26mpg ! It runs pretty good but seems to have lost a little power & I notice a little skip, once in awhile while accelerating. NO codes are showing up at all.
It has 52,000 miles, & at 30,000 a new fuel filter was installed. Also ,new Autolite plugs & wires at 35,000. It has a new air filter, & PCV valve. PCV hose is good . Good quality fuel injector cleaner was added in the last tank as well as throttle body & MAF cleaned . Tire are inflated to 35psi. It idles fine .
This SUDDEN drop has me puzzled & I would like to see a return of better MPG. As I said,, no codes have shown up on OBD code reader.
Any help & tips will be appreciated.


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