I don't fill all that data. Just put the essentials: miles travelled, fuel burned, ie, only the required stuff. The rest is optional.
I do the same, but it would be nice to make the form the way the user wants it. I mean who takes their tire pressures on gas ups? Everything considered it is a great site. I started using it to not tire rotation, oil changes, filter changes, etc.
There will be no changes to Fuelly. The man who owns the site is more concerned about his dealings in the RV world, and pays virtually zero attention to Fuelly anymore. I believe he only keeps it to increase the market value of his other web holdings.