By Mike Spector 

DETROIT--A review of federal fuel-economy standards in 2017 represents a "critical business issue" for auto makers as consumers increasingly flock to less-efficient pickup trucks and sport-utility vehicles amid cheap gasoline, U.S. Rep. Debbie Dingell (D., Mich.) said.

Ms. Dingell, the wife of Rep. John Dingell, the longest-serving congressman until his retirement in 2014, on Monday expressed concerns that federal mileage targets could be tough for auto makers to meet should gas prices remain cheap and consumers continue preferring larger vehicles that get worse fuel economy than smaller cars.

"You can't regulate customer preference," Ms. Dingell, serving her first congressional term, said on the sidelines of the North American International Auto Show in Detroit.

Federal mileage rules call for auto makers to sell a portfolio of light-duty cars and trucks averaging 54.5 miles a gallon by 2025, though trucks have a lower target than cars.

The fleetwide target for cars and trucks rises in 2016 to 37.8 mpg and 28.8 mpg, respectively.

Ms. Dingell, who once worked for General Motors Co. and is along with her husband a longtime industry ally, stressed the importance of protecting the environment and called the law in the 1970s that created corporate average fuel economy, or CAFE, "among the most important pieces of legislation passed in the history of this country."

But she said the ramifications of increased sales of trucks and SUVs amid cheap gasoline are "real" and "serious."

Auto makers plan vehicles years in advance, making them vulnerable to big swings in commodity prices, especially oil and the subsequent price at the pump.

Adam Jonas, a Morgan Stanley analyst, said in a research note that lobbying from auto makers for some relief on federal mileage standards could begin "now" in anticipation of the 2017 review.

Ms. Dingell's comments came moments after GM Chief Executive Mary Barra introduced the Chevrolet Bolt concept vehicle, which she said could get 200 miles on a single battery charge and only cost about $30,000. But the car won't be in showrooms until at least 2017.

GM's current plug-in hybrid with a backup gasoline motor, the Volt, doesn't sell nearly as well as its flagship truck, the Chevrolet Silverado, which consumes far more fuel. GM sold about 18,800 Volts in 2014, down more than 18% from a year earlier. GM sold more than 529,000 Silverados last year, up more than 10% from a year earlier.

"We fully intend on meeting the requirements," Ms. Barra said of the federal mileage targets.

Write to Mike Spector at mike.spector@wsj.com

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