So, I had this same problem and I finally found a work around. This work around is long and convoluted. I hope it helps someone.
1. Download new fuelly app from app store.
Create account on fuelly.com is you don't alreay have one.
The new app can NOT see any of the old data or records.
Next Sync your data with Fuelly, this may take 15 - 20 minutes
When that is done Sync the Fuelly app with the web site.
That should fix it. It worked for me, I then export data as CSV list. When I login to Fuelly 4 years of records appear on my dashboard, not sure what to do about that.