This week on Car Talk, is Scott obligated to marry his girlfriend, after she passed out from carbon monoxide poisoning in his Land Cruiser? Elsewhere, Ginny and her husband disagree over the optimal speed to drive on a road populated with frogs without croaking them (sorry). Also, a year of a flashing brake lights and noisy brakes has convinced Jim his van may have a brake problem; Camille may have to purge her key ring to save her Golf; and will this week’s Puzzler Answer give Tom and Ray yet another F in Physics? Find out, this week on Car Talk.