BBC: President Barack Obama is to announce strict limits on vehicle pollution that will set national standards across the US for the first time. The plan will save 1.8 billion barrels of oil by 2016 and be the equivalent of taking 177 million cars off the road, White House officials said. The rules would aim to cut emissions by 30% and set fuel efficiency at 35.5 miles per gallon (15km per litre). The cost of new vehicles is expected to rise by at least $1,300 (£842) by …