President Obama is announcing new fuel-efficiency standards requiring for the first time that fire trucks and concrete mixers, semis, heavy-duty pickups and all trucks in between must trim fuel consumption and emissions of heat-trapping gases. The White House says the standards that apply to vehicle model years 2014 to 2018 will save businesses billions of dollars in fuel costs, help reduce oil consumption and cut air pollution. Three categories of vehicles will be affected. Savings of 530 million barrels of oil and $50 billion in fuel costs over the expected lives of the vehicles covered by the new standards are projected, along with improved air quality and public health.