(Eric's response)
Right. It's not an apples-to-apples comparison. After all, I didn't buy the Kia Soul with eco-friendly dreams. I didn't think my purchase was helping save the world. But since that was a significant reason for buying your Prius, my question remains - is the Prius the most eco-friendly choice you could have made?
I just want us to weigh these relative "goods". What economic combination of car buying and charity would do the most "good"?
If your first and foremost goal is long-term environmental protection, is the Prius the best use of your resources? Probably not.
If you enjoy the Prius' design ingenuity, and are hopeful it also stems social good, well done.