It could be misleading in another way. At least some new vehicles come with servicing included in the price (touted as "free service") for some time, such as 2 years/24000 miles. Thus for the first two or so years service costs would show up as zero.
The only real purpose Fuelly serves is allowing people to compare their fuel use and costs with others. If you really want to keep track, use a simple notebook and track them for yourself. I'd suggest a computer spreadsheet, but with the continual changes in computer systems and storage, you would probably have to "upgrade" it and transfer the data before you wear out the vehicle you are tracking.
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