Well Bravo ...... my driver said that he would often fill up from the same big tank for JetA1 as the drivers delivering domestic oil ! Also I think you will find that there are literally dozens of people who have consistently used both with no effects at all on engine life etc . But believe what you want because it really doesn’t matter ! As I have said before, I would always use Jet due to provenance and checking and probably insurance but if I needed to put 28sec into my machine to get home I would happily!