According to a new survey by JD Power and Associates, approximately one third of consumers in the United States consider fuel economy to be a key factor when purchasing a new car. With fuel economy, dependence on foreign oil, pollution, and global warming weighing heavy on the minds of so many people recently, it may be a surprise to learn that in 1992, General Motors actually produced a vehicle that achieved 100 miles per gallon (MPG).In order to get a better idea of what General Motors has been doing for the last 25 years, it is important to first learn about another amazing vehicle: The GM TPC. The TPC (which stands for