Dear Tom and Ray: Can you use a hybrid vehicle to jump-start another car? Recently when my girlfriend was visiting me in Cleveland from D.C., her car wouldn't start. The first thing I tried was jump-starting it from my hybrid. Before I knew it, there was smoke coming out of both cars! Naturally, I panicked and quickly disconnected the cables.

Dear Tom and Ray: I got my copy of Drive magazine from Subaru today, and they talk about something called PZEV. Apparently, it stands for Partial Zero Emission Vehicle. What is it? - Mary Ann

Dear Tom and Ray: My Ford diesel has a warning about not overfilling the fuel tank. Precisely what would happen if you did this? Would damage to the engine or other systems occur? Most of us tend to "double-click" the automatic-shutoff fuel nozzle after it stops. Is this too much? Does this adversely affect performance? — Ray

Dear Tom and Ray:
OK, perhaps life begins at 50 with a 55-year-old sports car.

By Tom and Ray Magliozzi
Dear Tom and Ray: I have a 2003 4Runner V-6 that easily pulled my boat. So I bought a bigger boat. I would like to buy one of those super-heavy-duty Dodge Ram Crew Cabs with an enormous diesel engine to pull the new boat, but my wife won't let me trade in our house so I can afford it. So, I found ads for "performance modules" that claim an 18 percent increase in torque in my 4Runner, for about a grand.I'm hoping you'll tell me that one of these things really will work, and more importantly, that . . .

By Tom and Ray Magliozzi
Dear Tom and Ray: My dad was the kind of man who seemed to know about everything mechanical. Since he died, I miss being able to call and ask him some obscure question that he could answer; he really did seem to know everything. The other day, I realized that reading your column is the closest thing I've had to having my dad here for a resource. So, thanks for your humor and the information; although you're not old enough to be my dad, you're smart enough. My question: In your years of experience, . . .

By Tom and Ray Magliozzi
Dear Tom and Ray:I recently saw an article on a Web site claiming that car owners should pump their gas in the morning, when it's cool out, instead of in the afternoon, when it's hot. The alleged reasoning is that gasoline expands at higher temperatures and contracts at lower temperatures, allowing more "dense" gas to be pumped when it's cold.I personally think this is nonsense, since a car's gas tank also will expand and contract, and because gas stored in an underground 500-gallon tank probably . . .

The Virginian-Pilot
Dear Tom and Ray: I recently saw an article on a Web site claiming that car owners should pump their gas in the morning, when it's cool out, instead of in the afternoon, when it's hot. The alleged reasoning is that gasoline expands at higher temperatures and contracts at lower temperatures, allowing more "dense" gas to be pumped when it's cold. I personally think this is nonsense, since a car's gas tank also will expand and contract, and because gas stored in an underground 500-gallon tank probably . . .

By Tom and Ray Magliozzi
Dear Tom and Ray: I have a 2004 Toyota Sienna XLE with 28,000 miles. Last month while camping with our family of five, the big automatic sliding door on the right side of the car stopped working. We manually shut the door and did not open it again until we got home. Once home, my 5-year-old pushed the button to open that door, and the door fell off the car. Yep. Fell off the side of the car. It literally was hanging by part of one of the upper hinges. We tied it to the car and took it in to the . . .

The Virginian-Pilot
Dear Tom and Ray: Help! My wife will either kill me or divorce me based on your answer to the following question. I prefer to think that I am a law-abiding citizen, so if the speed limit is 45, I do 45. Usually, this goes on for only a few minutes before I am severely tailgated (less than one car length).The company I work for suggests in its safe-driving course to slow down and allow them to pass. Also, they say to never speed up; it only encourages them to get closer. My wife says to ignore them . . .