I thought GM and Ford were done with offering XFE packages but I've seen newer model vehicles with "SFE" or "XFE" badging again. RAM trucks even have a HFE package for their trucks. I remember GM and Ford doing this back years ago trying to eek out bits of MPG out of trucks and cars by offering a taller rear end gear ratio, LRR tires, tonneau covers, and shift lights in MT vehicles saying to upshift sooner. But do they really work or someone with a leaded foot just really don't care?