This entire story wreaks of BS. If they shipped the car with an empty tank, it would not have left the pump if they filled the car with gas. The GM system recirculates the fuel between the tank and the injector pump. If it started at all with a mostly gasoline fuel, it wouldn't have made it out of the station. If they topped the tank off with gas, it would have run just fine depending on just how much gas they put in it. WE don't get winterized diesel here and when it turns unusually cold here, you put super unlead in the tank to keep it from gelling. You can mix it easily to a 10% mixture and it runs great. While the car most apparently quit running, it wasn't due to a fuel mix up. Frankly, I can't believe the Secret Service would let the car out of the country unless it had a full fuel tank. The car MUST be ready to roll as soon as it gets to its destination. But then again, incompetency pretty much defines this president anyway.