Are you looking to move from GasCubby and start using Fuelly exclusively or would you like to keep using GasCubby? The reason I ask is because we are still working on a new version of the iOS app (GasCubby). Until the app with sync is released, it's best to only use one system.
If you want to use Fuelly only, you will need to click on search >> export and send yourself the CSV. From there you would need to open that file in Excel and adjust the columns to match the forum that Fuelly requires (found here).
We do plan to allow full cross platform access to your data from the web, iOS or Android but we are still putting the pieces together to make this happen. I plan to post a development update on this here in a bit.
Any time window on this Andy? this post was from the first of 2014. Gas Cubby crashes on iOS 8 GM. It worked fine on iOS 8 betas. Will there be an iOS 8 compatible version of Gas Cubby and if so, when? Thanks.