Why is my car burning so much gas?

I have a 93 Honda Accord.. and it usually gets 23 miles/gallon..
but the past couple of weeks it's been burning gas like no tomorrow.

I just filled it halfway last night, and only went to a few places (about 15-20 miles worth of driving), and now it's below a quarter..

Some people are saying I need a tune up.. others are saying it's my air filter, but I just got a new one a couple of months ago and it's still clean.

What is it?
Thanks :)

9 answers

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ANSWER #1 of 9

Try getting a locking gas cap because maybe somebody is siphoning your gas out of your gas tank.

ANSWER #2 of 9

Is your check engine light on? If so take it to an auto parts store and most will test it either for free, or like $20.00 with their little code reader and tell you whats wrong with your car. You then can work from there.

There are just so many things that can cause you to get worse gas millage its hard to say.

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ANSWER #3 of 9

Nah, the check engine light isn't on... I have my own diagnostic tool, but yeah.. it won't read anything.. I know I need a tune up, but I was wondering if that was the cause of it.
Thank you! :)

ANSWER #4 of 9

20 miles isn't enough to tell. It's probably just normal fuel gauge error. Try running it near empty, filling it up to full, and seeing how many miles and how many gallons that is.

Unless something's seriously broken (which would probably make your light go on) you shouldn't notice a change in gas mileage. A tuneup might add a couple mpg, which adds up fast but isn't something you'd notice casually.

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ANSWER #6 of 9

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ANSWER #7 of 9

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ANSWER #8 of 9

If you are a heavy footer pressing on the gas pedal all the time. The more frequent you do spirited driving, the worse fuel mileage you will get out of your car. I'm not too sure about hybrid cars though but chances are it's the same.

Another reason could be because of your air fuel ratio is lower than the “best” air fuel ratio (AFR) i.e. the stoichiometric with the number 14.7 for gasoline engine. It means for every lbs of fuel, the engine requires 14.7lbs of air to burn the fuel completely.

For turbocharged/supercharged cars, it's common for tuners to set the AFR lower than the stoichiometric number, around 12.5–13 for best torque/power.

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ANSWER #9 of 9

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