One of the more interesting tools available to those who wish to save money is BillShrink. Many people are already familiar with BillShrink’s ability to help you compare credit cards and cell phone providers and plans.

Gas prices have, for the short-term, edged back from the point where people aren’t complaining about them 24/7, but even so, you’d have to be Bill Gates not to want to save as much as possible on each fill-up. There are no shortage of Web sites that offer to find you cheap gas, and even iPhone apps aplenty, like Gas Buddy and Cheap Gas.

Now, though, Billshrink has added a cheap gas locator. This feature allows you to figure out where to get the cheapest gas along your chosen route. This tool can be used to help you plot out your refueling stops on vacation, or help you decide the best place to fill up on your way home from work.

Just enter your start and end locations — such as home and work — along with your car’s make, model, and year. Billshrink spits out an awesome map with suggested gas stations, their price, and details like whether they take credits cards and if you can pay at the pump. My favorite features: It points out the gas price for the grade of gas your car requires and the estimated total price for a fill up. It also breaks down cost for you depending on your distance away – if you have to drive 15 miles out of the way to get to that station, it will incorporate $.02 or $.03 per gallon into the price to adjust that cost.

Samir Kothari, one of BillShrink’s founders, talks about the up-to-date and accurate information offered by the new tool, “We get pricing data every four hours, since gas prices can change multiple times during the day. What might have been the best option in the morning may not be the best place to fill up in the afternoon. It may only be a few pennies a gallon, but over a year that can add up.”

One of the features of BillShrink’s gas prices comparison is that you can enter your normal fueling station, and your results will be listed according to how much you can save on each fill up if you go someplace else. As with BillShrink’s other tools, the gas prices comparison tool is completely personalizable. You can put in as much information — or as little — as you want. You can include you most frequent destination, set up to receive email alerts and enter information for multiple cars. I like the way the email alerts are set up especially. “If you fill up on Saturdays only,” Kothari points out, “you can set up the alert to only arrive Saturday morning, so that the best gas price is waiting for you when you are ready to go.”

Kothari says that BillShrink is working on a fully mobile version. But, for now, you can get alerts if your mobile has email.

In the end, I really like this tool. I don’t really need it for my local driving, since I go to one of the lowest-priced gas stations in town that is right by my house, but it is definitely something I will use when I go on roadtrips.