I will second that. I been adding my odometer reading to the comments section. Another thing that would be nice is adding fuel brand and octane but that is not critical. What would be is adding a pull down our a check box with bio fuel (both diesel and gas). For gas there are different Ethanol mixtures and the more bio fuel the worst the mileage. This affects comparisons.
We do plan to retool the signature image banners and provide more versions in the future but right now we are focusing our limited resources on other projects. We will add this to our list of feature requests but cannot provide an ETA at this time.
@TwoWheelMonkey - We do plan to introduce the ability to track gas types and subtypes along with location purchased in an upcoming release. It's something we have been actively working on.