Even GM tells you to basically just find a back road and drive very conservatively, topping the car off with proper fuel as soon as possibly, for amounts less than a full tank. This goes for most other companies as well. The only companies that takes huge issue are the Asians.

Going to try the filter, it is easy to do.

remember that engine under full boost will subject to the rings to a lot more heat than it will running the wrong a fuel when driven like Grandma.