so i have a problem.....

Start with cleaning your air filter. Could also be the O2 sensors.

jlds91389 said:

i will try to explain this a best as possible....so here it goes. no matter how easy iam on my car it burns a half a tank every 60 miles?

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The tank in the Mustang is ~13 imp. gallons. If you're using ~6.5 of those to travel 60 miles, you're getting 9.2MPG. I don't know if you're exaggerating but that's definitely a problem...

My supercharged GT does better than that, even driven "moderately" hard.

i drive my car pretty slow and easy any other time and i get way better mileage than that...

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Sorry, this senstence isn't clear to me. Is this a recent development? Does the on-set of the ****ty economy coincide with other work done to the car? You say the fuel filter is three months old: Did the drop in economy start at about that time?

Any mods? How long have you had the car? Did it ever get better economy or has it always been a pig?

so my question is what should i check? my fuel filter is around 3 months old and i changed the plugs about 8 months ago..could it be the cop? or the plugs..thanks for any help. jacob

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Are you getting an MIL (check engine light)?

How's the driveability?

Any fuel smells outside the car?

Have you read the codes lately? Burning that much fuel, I would think there's something else besides the rear O2's showing up.