South Florida Sun-Sentinel: Breaking America’s foreign-oil addiction was all the rage on Capitol Hill when gas cost $4 a gallon. Now that it’s under $2 and falling, history suggests the enthusiasm for alternative fuels and more efficient cars will subside. It did that in the mid-1970s and again in the ’80s and ’90s. But this time could be different. A confluence of factors — which didn’t exist or played lesser roles in previous “energy independence” efforts — is encouraging congressional leaders and …