Reuters: Environment Minister Jim Prentice said on Monday Canada aspires to be part of a stringent North American standard on fuel efficiency for the continent’s heavily integrated auto industry. “At this point in the United States, it would appear as though they are headed toward a 35 mile a gallon standard by 2020 and that would start to come into effect in the 2011 model year,” Prentice told the Canadian Broadcasting Corp in Washington. “We’ve essentially been prepared to go in that …