Great app, I use it quite often. I would like to know if you could add the ability to add octane levels as well? In doing so, could you also enable $ per Mile (in your graph)? Here's my goal: I'd like to find out how much more I'm actually saving per mile, based on octane. I have a hunch that lower octane fuel isn't quite saving me what it would seem. My vehicle doesn't go nearly as far on a full tank of lower octane than it does on higher octane. If I'm spending more per mile, that would be something we should be able to see with these added features in your app.