3 gas fill-ups have resulted in significantly lower mpg

Tiny
NEWYORKDESIGNER
  • MEMBER
  • 2003 FORD FOCUS
  • 82,000 MILES
I have a 2003 Focus SVT. The last 3 gas fill-ups have resulted in significantly lower mpg. The car has 82,000 miles, tire pressure is good, cleaned the MAF sensor, 10K on the spark plugs, no dragging of the brakes, air filter is new, no check engine light.

Engine and acceleration are fine, car runs as it has been only the gas mileage has dramatically been reduced. Oxygen sensor is my best guess but there are no codes.
Thursday, January 5th, 2012 AT 6:32 PM

4 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Also dirty maf sensor, ect irregularity, when was last tuneup? Has the weather been colder lately? Using ethanol gas?
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Thursday, January 5th, 2012 AT 7:01 PM
Tiny
NEWYORKDESIGNER
  • MEMBER
  • 2 POSTS
Weather is a little colder, not using ethanol gas. I cleaned the MAF sensor with no difference in mpg. Plugs and wires have less than 10K on them, air filter is new. Car has a factory temperature, oil temp and oil pressure guage all running at good levels.
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Thursday, January 5th, 2012 AT 7:10 PM
Tiny
FIXITMR
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It's amazing how many stories of bad mileage for focus there are on net! No pat answers yet though and much has been tried.
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Saturday, January 7th, 2012 AT 12:18 PM
Tiny
FIXITMR
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  • 9,990 POSTS
Basically short hops in cold weather are gas guzzlers comparatively speaking.
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Saturday, January 7th, 2012 AT 12:21 PM

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