Fact: Driving slower saves you gas. Like millions of Americans, I listen to the “Car Talk” guys on Radio mostly because they make me laugh. But they also dispense great auto advice, and they stress that slowing down makes a big difference: For every 1,000 miles you drive (figuring gas at $2.50 a gallon and 25 MPG fuel efficiency), you’ll save as much as $15 driving 10 mph slower. Of course, with gas nearly double that price now, the savings should double as well. Something to think about if you’re a speed demon.