thegoalie, I just went down to my car to check the name. It's "Pennzoil Roadside Rescue Emergency Fuel Additive." According to the label if immediately upon running out of gas you add it to your tank, the 64 oz bottle will take you 10 miles. It contains no gasoline or alcohol so it's non-flammable. It doesn't really say what it contains. Now before anyone asks me what in the world I'm doing even contemplating putting some mystery liquid in the gas tank of our fine piece of German machinery , let me say that I've had this bottle of stuff for about 5 years (first in my prior car and then in my Crossfire) and have never used it. The whole idea is you never need to use it, but if you end up on one of those highways where it's oh too long to the next fuel stop, diluting the tank is better than getting shot or assaulted on the roadside. It's a little insurance policy.

Thanks for asking goalie, when I went to check the name, I saw it was a little expired (not by much - has a pretty long shelf life) so I'll need to pick up a fresh bottle.