The drop in oil prices that's beaten down the cost of gas at the pump is a "double-edged sword," experts say: great for gas-guzzling auto owners and gruesome for government policies. A nearly 44 percent drop in oil prices since June has triggered a gas-price slide to around $2.40 a gallon, and reignited the American love affair with big cars and trucks, with sport-utility vehicles and trucks chalking up 52 percent of auto sales in October up from 49 percent October 2013 and 44 percent in October 2008, The Wall Street Journal reports.