I may have to let the login issue go - it is possible I did not update Fuelly with my new email address when I migrated from one email account to the new one. I was pretty sure I had changed all my logins, but the possibility remains that I missed one. Although it is odd that my browser saved email/password for Fuelly was my new one...?
After I fill in the fuelly 'add fill-up', I usually just toss the receipt away, so I don't have any conclusive proof of dates, mileages, etc in July unfortunately. I just know that I must have had at least one fill-up in the month, as a tank never lasts more than 2-3 weeks, and my last fill-up recorded on here is from the end of June, before I went away at the end of July. I always use the site by the way - never the app. I have never noticed any fill-up *not* update the records appropriately.
Just to aggravate the situation, the first two fills after my return were only partial, so it won't be until I next fill up that any sudden spikes in mpg/mileage etc will show up.
I just wondered if it was perhaps possible to look at any pre-upgrade data backups to see if anything was there which isn't now? Although I appreciate that's probably quite a job to undertake just for one person's record...