Gas prices yesterday, April 4, 2007, spiked to $4.00 per gallon in some parts of the United States. And the worsening, and seemingly untenable situation in the oil-rich Middle-East has some prognosticators heralding prices of $6.00 per gallon by year’s end. Americans are, quite justifiably anxious, alarmed, and seeking more fuel efficient (cheaper) means of transportation. This has led to…