http://usnews.rankingsandreviews.com/cars-trucks/daily-news/080619-Mexico-Sees-Gas-Shortages-as-Americans-Cross-Border-to-Fill-Up/
Gas is often as much as 40 percent cheaper in Mexico than it is in the U.S., thanks to a Mexican government subsidy that keeps prices down across the border. As we reported last month, many Americans in border states have realized this, and begun crossing the border to fill the tank.
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