Americans appear to be gearing up for further increases in US gas prices, as green-car sales last month had their largest year-over-year gains of 2014. Domestic customers bought almost 56,000 hybrids, plug-ins and diesels in April, marking a 2.6 percent increase from April 2013. Plug-in sales were particularly strong, jumping 41 percent from a year earlier, as sales of the Chevrolet Volt extended-range plug-in and Nissan Leaf and Tesla Model S battery-electric vehicles all showed gains.
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