I've put a little over 1000 miles on my Sport. Most has been commuting to work,which is 23 miles one way on freeway. Morning commute speed ranges 70-80mph. Afternoon commute is rush hour type traffic so speeds can vary from 10-70mph. All this said, I would say that only 60-70% of my miles would qualify for typical highway mileage. According to the Sports computer I am consistently getting 23.9 mpg(was getting 24.4 when I was really babying it). I haven't run the numbers myself, but if we were to assume the computers numbers are accurate, I would say I'm getting better than the epa numbers.
I'm on Android, I personally have tried about half a dozen apps in the past, before deciding on Fuel Buddy. I can track more than just fillups - Service, expenses, and trips (and the trips will actually mark your distance with GPS). When I finally found the app, it looked terrible but the functions were awesome. I sent an email in to the dev about the GUI, and wouldn't you know it they eventually (took probably about a year) did a whole revamp of the GUI. It's pretty awesome overall, and you can even take pictures of your receipts so you know what fueling station it was, all of the exact parameters of the fill, and you can customize the input fields, so as an example if you prefer to do cost per gallon and number of gallons for total cost, or if you prefer to do total cost and number of gallons which will derive your cost/gal. Also makes it super easy to find out where you got bad gas from, with proof of the location.
