SALT LAKE CITY -- Lucky Stores, a division of American Stores here, and Ralphs Grocery Co., Compton, Calif., plan later this year to test new technologies designed to reduce the effects of truck emissions. Lucky's Southern California division will test fuels that combine liquid natural gas and diesel fuel. Liquid natural gas produces virtually no emissions and is safer for the environment than traditional fuels, sources told SN. Ralphs will test a system designed to make its trucks' diesel ...

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