detroit u.s. president donald trump announce review last week tough obama-era vehicle emissions fuel-efficiency standards proclaim assault american auto industry over rule set environmental protection agency may take backseat consumers demand vehicles guzzle less gas automakers meet tough standards want export cars overseas accord auto industry analysts end u.s. carmakers may gain years meet stringent target former president barack obama administration negotiate company 2012 analysts say europe china continue toughen emissions standards u.s. might become outlier american axle president mike simonte tell reuters thursday trump move widely see lead rollback loosen stringent target would slash vehicle exhaust emissions effectively double average fuel economy 54.5 miles per gallon 2025. automakers argue rule 2022-2025 expensive could cost american job trump administration review see win conference call thursday investors bob shank ford motor co chief financial officer say seek rollback way want conversation around level want achieve despite epa may want california nine state zero emission vehicle program eight northeast plus oregon expect move ahead friday previously establish target state account nearly 30 percent u.s. auto sales potential divide rest country could create two-tiered environment two set regulations say mark wakefield manage director alixpartners automotive practice could drive cost high automakers build two versions vehicle meet two different standards alliance automobile manufacturers trade group sue overturn obama-era rule behalf several big automakers write white house thursday urge talk begin quickly california ensure national standards remain place automakers seek certainty predictability rationality time regulatory process group ceo mitch bainwol write kristin dziczek director center automotive research labor industry group say u.s. automakers could find hard export cars market china europe tough regulatory regimes u.s. target rescind think go see rollback say think may see slow timetable implement tough standards alixpartners wakefield say china world large market continue push electric vehicles america backpedal could lead movement investment u.s. china especially latter market continue grow general motor co fiat chrysler automobile nv refer reuters public comment make industry lobby group alliance automobile manufacturers epa administrator scott pruitt climate change skeptic say obama administration estimate would cost 200 billion 13 years comply strict standards believe lead high price consumers job leave country morgan stanley analyst adam jonas say auto industry expect miss 2022-2025 target regardless occupy white house believe epa recent move may carry relatively little weight things likely drive fuel economy would rank epa distant third list behind consumer preferences direction technology say unite auto workers union president dennis williams say around 60 percent u.s. auto sales currently truck suvs consumers value fuel-economy improvements vehicles automakers make mistake slide backward williams say protect union members understand also look future trump 's auto review may slow march good fuel efficiency