It is my understanding that to protect the POTUS on foreign trips many of the supplies are transported from the US presumably including the fuel for the limo. The current limo, the Beast, is diesel powered. I can’t imagine the Secret Service screwing up in fueling the limo with local fuel or not knowing what fuel to use. Perhaps the Secret Service was too preoccupied checking out the local brothels.
[Beast pulls up to gas station. Secret Service agent gets out to pump diesel. "The Won" spies some Palestinians lingering nearby, gets out of the limo to show off.]
The Won: "Here, here! Step aside. I'll pump the gas." [reaches for wrong pump]
SS Agent #1: "But sir..."
The Won: "I said, step aside!" [waves and smiles at Palis. Puts wrong fuel in limo]
[SS Agent #1 gives helpless look to SS Agent #2]
SS Agent #2: [Smiles, whispers to SS Agent #1] "Let him do it. This'll be priceless."
The Won: [finishes up, flashes thumbs up to Palis, gets back in limo] "Alright! Let's go!"