Remember Heather and her cranky mechanic Helmut? Heather took her Volvo to Helmut for a stuck glove box and wound up spending $3000 for a new fuel system, only to have her car begin dying at high altitudes. This week on The Best of Car Talk, Heather returns for a round of Stump the Chumps and we find out how much of a dummkopf Helmut was. Elsehwere, Lori’s boyfriend has begun collecting old cars but can’t drive any of them due to his poor vision. Will Tom and Ray help Lori convince him to try a different hobby? Also, Carol’s mechanic says her Mazda’s bad gas mileage is due to too many drivers; and Tom and Ray may need to resort to hypnosis to diagnose Joel’s Mercedes’ snore. All this and more this week on The Best of Car Talk.