This week on Car Talk, Gary's mother-in-law is blaming him for her car catching fire after he worked on the carburetor. Can Tom and Ray get Gary off the hook, and, more importantly, get his mother-in-law out of his house? Elsewhere, Barry's noticing a plethora of dead bugs on his windshield, and thinks driving faster should reduce the casualty rate. Also, Denise may have bitten off more than she can chew by giving into her mid-life-crisis impulse buy of a vintage Volvo; Alan is considering a sitz bath to get his truck to start shifting; and Darlene can't decide which bubble-headed friend's advice to follow on filling her gas tank, so she's turning to two more bubble-heads. All this, plus one listener's rebuttal to Melissa Peterson, and lots more, this week on Car Talk.