I had linked this before, but give this a look. This is a 2007 Excel spreadsheet designed to import data straight from the exported CSV Fuelly files. Instructions are in the first page.
It can do up to 10 vehicles/200 fill-ups, but this can easily be expanded as needed. It will also process up to 10 partial fill-ups in a row and total that with the next full fill-up. All figures in RED must not be changed, as it will alter the calculations.
It will also do time figures and can predict a yearly mileage, or average it, if you have more than a year's worth of data. It uses whatever the earliest date of your tracking to automatically calculate days, hours, weeks, months, whatever. And it does factor in for leap years.
It can provide per vehicle totals as well as overall totals.
If you like it, it would not take much for me to add in cost factors for a variety of things like repairs, oil changes, whatever.
At the moment, this sheet is setup on the premise of US based figures, meaning miles and gallons, and setup to use odometer readings, rather than trip. But I can easily adjust this as needed, just depends on interest in this.
Take a look, let me know here.
http://art.cariboucomputers.com/beretta/fuelsheet.zip
Thanks.
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