I have a 2020 Mk3 Honda Jazz (one of the last ones before the Mk4 - a hybrid - came out in the UK in May). I've done 6 fuel ups but the car doesn't show up in the Honda Jazzes listed by owners. In fact there are no Honda Jazzes after 2018. Seems unlikely that no new Jazzes have been added since 2018.
It's possible, I've found similar oddities myself. When researching Porsche panameras as a potential buy, I was curious to see what kind of economy the 3.0 litre diesel could achieve. Except not one listed on fuelly is diesel, which is odd, because its the most common engine. You could try direct messaging an admin to see if they have any further information for you.
Just bumping this up again. After 9 fuel ups my car still isn't showing in the "Browse Vehicles" stats. Several Jazzes have been added of late although there are still no 2019 or 2020 models. What am I doing wrong?
I believe there is a minimum number of a model and year required registered before Fuelly shows the data publicly. The goal is to give visiters an idea of what a car's real world average fuel economy is, and you can't have a meaningful average when there is just two or so examples.