2004 Pontiac Vibe Q&A

2004 Pontiac Vibe Question: High idle rev - low gas mileage

My average city gas mileage is 25 mpgs - not good, right? I have just tried cleaning the MAF, so I will see if there is a difference. Also, even in the summer, the startup idling rev's are close to 2,000 ... can I adjust this? -
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