About the graphs: I'm finding the monthly bar graph displays figures too broad to show fairly significant changes of up to 8% in my gas usage by month. That 8% change is 2 mpg average per month. I would say that's significant, but it barely shows up on the broad graph. And the recent fill up chart is kind of the opposite; seemingly too narrow a scope.
Yeah, as we get more data, we'll definitely start tweaking things to make them more useful. I agree with what you're saying and I'd say we'll take a look at reformatting the graphs in a week or two.