Perhaps targeting those whose Christmas stockings were filled with a set of car keys, Sirius XM is offering another free trial to encourage new and/or used vehicle owners to sign on. From February 1 through the 14th, the satellite service is offering 60 of its music, sports, news, talk and entertainment channels free, simply by turning on the unit. The deal also includes online listening of the “Sirius Select” package of 130 channels, via computer, smartphone or iPad, after a no-obligation sign-up. In addition, that package is being offered for six months at $25 a month, with the activation fee waived, before March 16. Sirius XM offered similar trials last November and August.