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Q: Bad gas mileage. on 2004 Hyundai Accent

In th epast few weeks I have seen the needle on my gas gauge drop way too fast and for no reason. I calculated my gas mileage to about 20 mpg when a month ago I was getting about 35 mpg. I don't know what happened but any help would be much appreciated. Thanx
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I am having a similar problem with my 2007 Accent 3-Door Sport. I used to get about 400 km per tank in the city. Now, all of a sudden, I'm getting approx 250 km per tank. I took it to two seperate Hyundai dealers and they can't find the cause. REALLY frustrating and REALLY expensive.
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