Sure you want to save gas, but there's a lot of bad advice on how to do it. Some of it makes no difference, and some of it can wind up costing you. With gasoline prices hitting record levels, it seems everyone has a tip on how to save fuel. Much of the advice is well-intentioned, but in the end, much of it won't lower your gas bill. Here's a look at a few misconceptions: #1. Fill Your Tank in the Morning You may have heard that it's best to fill your gas tank in the early morning while the...