[Brian in Oregon]

Well, mention was made in one article about it costing perhaps $25 per year to the average motorist. Let's assume that means someone who does 10,000 miles a year at, say, 20 mpg. That's 500 gallons. Now divide $25 by 500, and you get a difference of five cents a gallon. I realize these figures are rough, so substitute your driving to get a better idea for your individual situation.