Does exactly what I want I recently got a hybrid and wanted to track my mileage. I looked at several apps and all of then but this one wanted permissions I didn't see a good reason to grant. Downloaded it  installed it  love it. It's easy to enter the info and does all the calculations for me. Keeps a log automatically  gives me great stats. And doesn't upload my contacts to some server in Outer BFistan for who-knows-what-reason.
July 29 2015