As caradiodoc said, without diagnostic information no one will really be able to determine your problem. That being said, a few things to think about:
City driving is less efficient.
Using the A/C will reduce efficiency.
Improperly inflated tires will also reduce efficiency.
When was the last tune up? It might worthwhile to consider it. 4 NGK plugs cost only about $10 on RockAuto, a new wire is a little bit more. In fact, most of the things you'll need are in the $10-$20 range. But, if this isn't something you've done before, I'd recommend partnering with someone who has a bit of experience.
Friday, July 1st, 2011 AT 4:10 AM