This week on The Best of Car Talk, Jenny's fiance, a budding bryologist, thinks she's crazy because she swears her car is more difficult to start when its low on gas. Should he stick to moss and stay away from fuel dynamics, let alone female psychology? Elsewhere, Angela's smelling something sweet from her dashboard, but the cost to fix it will be mighty sour; Eric is wondering how a $4 part could require $358 in labor to replace; and David is trying to decide which of two heaps to dump, when the answer should probably be both. And, in the midst of New England foliage season, New Hampshire native Kurt has lots of time in traffic to profile the tourist drivers slowing him down the most. All this and more, this week on the Best of Car Talk.