The United States Department of Transportation set the new average fuel‑efficiency target.
The target is lower than the previous goal of about 50 miles per gallon.
Car makers say the rule gives them certainty for planning new car models.
Environmental groups and some states are challenging the rule in court.
The rule aims for an average of about 35 miles per gallon for all new cars by the year 2031.
States like California argue the rule does not consider the growing number of electric vehicles.
The rule could lower the cost for car makers but might raise gasoline prices for drivers. ⛽
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