Looking to save money on fuel? This fabulously simple and effective tool calculates your fuel efficiency in terms of both mile per gallon (mpg) and mile per dollar (mpd). Entries are stored and are able to be viewed and modified. This tool will help you calculate and keep track of your fuel efficiency. Use it to estimate costs, detect maintenance problems, determine your vehicle''s optimum octane rating, and a wide range of other applications. Records date, odometer reading, distance, fuel volume, price per gallon, % city driving / % highway driving, and octane rating. Notes on each entry can be recorded.