I have already written to the webmaster and the answer was that currently it's not possible, but would let the developers know...that was one month ago and nothing changed.
The owner of Fuelly is Andy Robinowitz in Southlake, TX. He has no interest in maintaining this site anymore, and last time I finally had to blow up his cell phone to get Mini-Stats in 2024.
The site is a ghost town, a pale shadow of what it used to be. I'm discontinuing use, and I encourage everyone else to do the same.
There are lots of people using the site. Please update the site. Alternatively, why don't you hand over admin of the site to someone keen here on the forum?