By Phil LeBeau, CNBC Correspondent NEW YORK ( CNBC) -- Now that the Department of Transportation and the EPA have locked in the new fuel efficiency rules guiding the industry through 2025, the focus shifts to how automakers meet the CAFE standard of 54.5 MPG 13 years from now. The fact is, they're not sure. At an event outside Detroit on Tuesday Chrysler CEO Sergio Marchionne told the Detroit Free Press, "Everything is on the table. We are struggling with some big choices we need to make." Here's what the automakers are facing when it comes to fuel economy rules: Currently: 27.5 MPG 2016:34.1 MPG 2025:54.5 MPG
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