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Why is my car burning so much gas?

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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 :)