(May 26, 2017, 1:48 PM EDT) -- DETROIT — Consumers of diesel-model Silverado and Sierra trucks made by General Motors LLC from 2011 to 2016 filed a class action May 25 in Michigan federal court against the automaker and the manufacturer of a part that allegedly allows the vehicles to cheat emissions tests, claiming that the car maker misrepresented the vehicles’ fuel economy and emission levels (Andrei Fenner, et al. v. General Motors, LLC, et al., No. 17-cv-11661, E.D. Mich.)....