Alliance AutoGas certified to serve newer Silverado, Express models
Alliance AutoGas received Environmental Protection Agency (EPA) certification of the Prins VSI propane autogas system for 2012 and 2013 GM 4.8-liter and 6.0-liter vehicles, which include the Silverado and Express. According to Stuart Weidie, president of Alliance AutoGas, five additional EPA certifications for vehicles are currently being processed and will be complete sometime this quarter.