Yes, licensed--iGasUp isn't sold or given away, like many of the other gas station finders. I assume because of their use of the Oil Price Information Service, iGasUp is licensed on an annual basis. For US$3, you can use the program for a full 12 months, after which time you'll need to relicense it. Given we're not there yet, it's hard to say how hard or easy this relicensing step will be. However, if you take advantage of the gas savings the program can find, saving $3 is trivial, as seen in my previous example.

iGasUp's preferences let you specify a preferred grade of gasoline; what you set here determines the price you'll see in the results list. You can also specify a search radius in square miles, and whether you want the default list view to be sorted by closest or cheapest. iGasUp's coverage seems to be excellent for the major chains and retail-outlet-located stations, such as those at Safeway. It didn't, however, find any of the Arco stations in my area, which are relatively common. I also didn't see any independent stations in the results, though those are getting rarer and rarer by the day. Unlike its end-user-based competitors, you won't be able to add such stations to the iGasUp database; if a station doesn't participate in OPIS, you won't see it in the results listing.

This latest version of iGasUp addresses all my complaints with the previous version, save the occasional crash in map view. If you can live with a (relatively cheap) annual fee and potentially not finding every single station in your area, iGasUp offers the most accurate and up-to-date pricing information of any of the gas station finders I've tested. While it will never have the breadth in coverage you'll see in the programs with end-user-created databases, there's something to be said for accurate and timely information on gas prices. For that reason alone, iGasUp now has a permanent home on my iPhone's screen.

iGasUp is compatible with any iPhone or iPod touch running the iPhone 2.x software update.

[Senior editor Rob Griffiths has also reviewed iPhone-based fuel mileage trackers for iPhone Central.]