Gasbuddy.com has a new Fuel Logbook feature for its registered users. It looks pretty good. Not to mention the site will help you find the lowest regular gas prices in your area.
That's what I use...it's been on the Twin Cities MN version for at least a couple years. One downside is that it starts a new log each Jan. 1...you can look up the detail and totals for prior calendar years, but would have to do a quick bit of math to do lifetime figures. rpm
