pathtoefficiency:

like it or not, even if the energy wasn't used IN the factory to build you car, it was produced, and thus the pollution that goes with it, to make the energy to build your car. thus you are ultimately responsible for it. without your purchase, it would not have been made.

That would only be true if the car were made to order, which it isn't. It gets made and (presumably) someone buys it - it could be you, it could be someone else. Of course, if enough people buy them the manufacturers make more - but really, it isn't my fault that energy and materials got put into whatever I'm buying, if it was made according to a standardized procedure on an assembly line.

Also, what Sakura said was right: there's no point in bringing the actual operation of the car into an argument about how much energy it took to manufacture. When someone asks you how many BTUs went into building the car, talking about how much energy goes into operating the car is not relevant. And every machine, whether it's a car, a server or your dishwasher, wastes some energy in the course of its normal operation, so that isn't something you can hold against the Prius. In fact, part of the point of a hybrid is that it's designed to use less energy, because when you roll down a hill you get some of that momentum back as power for your car.

What with all the figures and irrelevant information you're throwing around, I can't really tell what you're actually saying anyway. Since you are writing and not talking, you have the time to work out a reasoned argument: there's no excuse for not doing so, especially when you're trying to tell someone else they're wrong.