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There are a number of e-mails circulating around the web telling you how to save gas, improve your fuel efficiency, save the world, etc. Some of these advice columns are offering as much as 100 gas saving tips in all. This has made us all very busy little bees trying to save a drop here and there.

While this has brought the pleasant placebo effect in making us feel better about driving around everyday... in effect a few of these may not be doing as much as you had thought.

Both Consumer Reports and Edmunds.com have done a series of tests looking at some of these tips and deciding which are worthwhile and which were not. Here is a quick summary of three of the most commonly misunderstood beliefs being circulated today.