I wouldn't suspect plugs with mileage dropping off somewhat suddenly. Still, at 96K in 11yrs I'd be changing them and the O2 sensor, and whatever PCV/EGR valves it has. That assumes you didn't buy it 2yrs ago from someone who gave you great service records... (hint, hint?) I'd be looking for vacuum leaks, too. There may be other wear items to consider. Don't buy everything but pay attention to the parts they offer to sell after dumping codes, and get the codes, not just the interpretations.
Declining mileage can be evil but it's usually a matter of replacing a couple wear items. I'm willing to bet you'll notice a power improvement, too.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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