The 2015 Silverado and GMC Sierra HD's bi-fuel, gasoline-compressed natural gas offerings will now be available in all cab configurations, short and long box, and two- and four-wheel drive models, in 2500HD and 3500HD series. GM's 6-liter V-8 with hardened valves and valve seats allows the vehicle to operate on gasoline or compressed natural gas. The driver can switch between fuels at will; when the CNG tank is depleted, the system automatically switches to gasoline. The pickups have a standard combined gasoline-CNG range of more than 650 miles, GM officials say. With CNG currently priced about 62 percent less per gallon than gasoline, a work truck driven 26,000 miles a year can realize a fuel-cost savings of more than $2,000 annually, based on 75 percent CNG usage and comparable efficiency to gasoline, GM officials say.
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机译：2015 Silverado和GMC Sierra HD的双燃料，汽油压缩天然气产品现在将在2500HD和3500HD系列的所有驾驶室配置中使用，包括短厢和长厢以及两轮和四轮驱动模型。通用汽车的6升V-8带有硬化的气门嘴和气门座，使车辆可以使用汽油或压缩天然气。驾驶员可以随意切换燃料。压缩天然气罐耗尽时，系统会自动切换为汽油。通用汽车公司的官员说，这些皮卡的标准汽油-CNG组合射程超过650英里。通用汽车公司的官员说，由于目前压缩天然气的价格每加仑汽油要比汽油便宜约62％，因此，基于75％的压缩天然气使用量和与汽油相当的效率，每年行驶26,000英里的工作车每年可节省2,000多美元的燃料成本。
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