If you're good with Excel, make a spreadsheet. I made myself one. After each tank, all I do is input my km, L, and $/L into a new row. I set it up so it gives me US Gal, $/tank, miles, L/100km, and US mpg. I also have lifetime averages calculated for L/100km, mpg, $/L, km/tank, $/tank, $/km. It's neat! a good record to keep with all the information, it's easy to use once it's set up, and it makes inputting numbers into the fuel log easier. Probably more accurate too.
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