We added it a while back so that if you have more than fuel-up in a day you can set the time to show which fuel-up came first. It's a fairly rare case so we only show the option on edit so you only have to worry about time if you run into the multi-fuel-up problem.
We show the time if you do a fuel-up export, but not on the site. We only use it on the site for sorting, so the earlier fuel-up will appear before the later fuel-up on the same day.
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