So just to be clear... rather than trying to talk to the witnesses we all decided to go back to headquarters?
As I tried to describe in my previous most, Fynn really would have liked to pay a visit to the gas station and get his hands on the CCTV recordings and other stuff, but also was under the impression that the cops might have just the same idea so the confrontation Eleanor tried to avoid by buying time would just happen there instead of the accident site and ultimately be caused by him. So he decided against that and drove straight back to the offices in order to have a deeper look into the data from the car he did not yet have the opportunity to analyze in detail on site.
I hope that decision was within reasonable bounds :)
If I might try and propose a solution: Any potential clue that cannot be retrieved from the gas station right now because many of our characters are already back at HQ could still be tried and retrieved later from the police who might have done the job in the meantime. Either by just going there and talking to them in the charming enchanting manner our characters have to offer and/or by not so perfectly legal intrusion, be it physically or via the internet.
So far I imagined the HQ to be pretty much standard offices rented from some company that either doesn't know or doesn't care to ask questions about all the modifications potentially going on in there. I really do like the suggestion of them having been an abandoned floor though!