The gas budget for our vehicles travelling roughly from Portland to Boise is about $60, each way. Craig Henderson, originally of Tacoma, plans to drive about twice as far - from the Canadian to the Mexican borders, on Interstate 5 - for $42. Or less.
It has to do with the way his car is designed, to get more than 100 miles of travel per gallon.
As the Northwest (Oregon most notably) gets more into alternative forms of powering motor vehicles, this would be a story worth reading.