Your window
Built from how this fleet actually runs, not a default.
Off hours
A swipe at 2 a.m. is a question, not a verdict.
Night fuel is normal for some lanes and a tell for others. The clock does not prove theft. The missing truck does.
Set the window from your operation
I do not import a generic night rule from another fleet. A team that runs nights will have honest 2 a.m. fills. A day fleet will not. The first pass uses your dispatch pattern, then flags what falls outside it.
The flag is still a match problem. Time is only the reason the line rose to the top. GPS and the tank decide what kind of line it is.
What the Monday note should say
Count the off-hours gallons. Say how many had a truck at the pump. Name the ones that did not. That is enough for a person who owns the numbers.
I can keep this as a standing check after the audit. It is one of the later questions, along with idle and detention, once the fuel match itself is honest.
What I look for
An off-hours line needs three facts
The ping
Was a company truck at that pump at that minute.
The tank
Did the level move in line with the gallons.
Short answers
Before you book.
No. Night dispatch makes night fuel normal. I flag what falls outside your pattern.
Yes, after the audit. It stays read-only and a person still clears the list.
Next step
Let's set an honest window for your fleet.
Tell me if you run nights. I will tell you whether off-hours fuel is a real leak or just the job.