OK,
I've made a few other attempts to import the data from my 5.0 version... as per Fuelly support: Fuelly #ZQG-263-56591
"Thank you for sending this file.
I see the error in the import, but I am not sure what is causing it. The error shows an issue with the Date/Time column, but I have verified that the export for aCar 4.8 and 5.0 is identical.
The only option that I can see to get this to work easily is to break the CSV into 2 different files. One file for fuel entries and another for the service. Also, remove the metadata from the top of the CSV to leave only the header and the data in each file. Then, use the Plain CSV import option."
So, the deleting of Meta data didn't work. I've even deleted rows trying to match up headers for other data to get it to work. No dice. Here's a screenshoot of v4 (left) and v5's data (right):
https://i.imgur.com/pNxUDBFl.png
I'd really like to compile this stuff... anyone else have any tricks?