A couple of months back in March 2013, the US Environmental Protection Agency (EPA) released proposed Tier 3 gasoline regulations that, if approved, will go into effect on January 1, 2017. The new rules include lower sulfur specifications for gasoline and tighter emissions controls for motor vehicles. Tier 3 also encourages acceptance of higher percentages of ethanol in gasoline. These regulations come at a time when US refinery gasoline blenders are jumping through hoops to handle a flood of new light shale crudes and increased demand for natural gasoline exports to Canada. Today we examines the proposals and their impact on gasoline and natural gas liquids markets.