Q: it looks like i'm lossing about 100 miles out of a full tank of gas on 2005 Hyundai Sonata

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i just got a new belt, water pump and changed the spark plugs
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no codes or check engine light? maybe you have evap system problem or as simple as put a new gas cap
no check engine light,,,, new gas cap???? i also just got a new fuel pump with the other parts