I tow a 2008 Saturn VUE and the manual gave the same instructions - max speed of 65mph and start the engine and move the shifter through the gears every 500 miles. Recently, I saw a posting in FMCA magazine where these cautions had been removed by GM and there were no restrictions for the VUE. I'll find the magazine and look at the HHR if it is listed. I seldom go above 65 or travel more than 500 miles a day so these were not cautions I've been concerned about.