I take it you no longer have the data. Just make one up. If you had done roughly 400 miles and had roughly 30 mpg, then enter an invented fill up for similar figures. For all the difference it will make to your 3 years data it will be neither here nor there.
2006 Honda Jazz 1.2i-DSi S Vivid Blue Pearl
Every time I try to fix this error, I end up losing more data to the point now where I don't know where I am. Surely they have a system where you can roll back data but alas no.
Fuelly is the most useless frustrating program that I have ever encountered. Constantly coming up saying I have an error when I don't,and not saving till I fix the non existent error!
I certainly wont be recommending it to anyone and wont continue to use it!