The lowest oil prices in over six years have fueled a resurgence in U.S. gasoline use in recent months as more Americans take to the road. Demand is expected to climb 1.5 percent this year to nearly 139 billion gallons (526 billion liters) according to the government’s most recent forecasts, enough to easily accommodate small increases in ethanol quotas without breaching the so-called “blend wall” that refiners say puts a cap on blending at around 10 percent of total gasoline and diesel supply.