I would love to see a mini stat available in the list that shows 'gallons consumed so far this month', so that I can compare directly to 'gallons consumed last month.' The reason I want this option is that I have a choice on my daily commute: A longer route for better mpg, or a shorter route for lower mpg. By my calculations I would still use the least amount of gas by taking the shorter route with poorer mpg. If the goal is to use the least gas (and produce the least CO2 and spend the least $$$), rather than to maximize mpg, such a statistic should be made available. Thanks for considering this suggestion! It would be good for the planet and our wallets!
If you go to your vehicle profile page while you're logged in you'll see something called "mini-stats" under the "Basic Stats" section. Click that, and you'll be able to add specific statistics for specific timeframes. For example, you can add "Avg MPG" for the "Last Month". We don't have an option for "Previous Month", but depending on how often you fuel-up, it should be pretty easy to eyeball in your Log Book.
We also show a chart that gives you an average MPG/month once you have at least three months of data. That should give you a quick visual indicator of how your vehicle performs per month.
If you need something beyond these you could always take a look at our export feature and build your own graphs or calculations in Excel or Google Spreadsheets.