Your comments

I second this suggestion. Before I found Fuelio I used to track both mileage and fuel use manually but, crucially, I would rarely note down both values at the same time. While I accept this means that I won't be able to use my historical data to calculate fuel efficiency ratings, the data they contribute towards the monthly mileage and monthly fuel cost statistics are still perfectly valid. It's a shame that Fuelio isn't capable of processing them and, until it does, I won't be able to do away with my spreadsheet entirely, lest I loose most of my data