Can I remove one fill up?
 

Don't know what I did but I have one fill up at 50 some mpg and it's wrong. Maybe I copied the mileage wrong. Anyway, can I edit that fill up, remove it from my average?

Once you've added a fuel-up, you can edit or remove it at any time. To edit a recent fuel-up, go to your vehicle's page and look for the pencil icon in the Log Book (list of recent fuel-ups).

If you want to edit or remove an older fuel-up, go into your fuel-up log by clicking the View All Fuel-ups link on your vehicle's profile page. Locate the fuel-up you want to change and click edit next to the fuel-up time.

Here's more help in our FAQs about this... https://www.fuelly.com/faq/16/edit-a-fuelup