Jeff is a car guy. He was describing how he saved his friend $6,000.“My friend’s all amped up,” Jeff told me. “He wants to buy this car. This exact Toyota 4Runner. He’s excited. But the numbers weren’t right. I looked at him and I said, ‘Listen, you drag me here, you’ve wasted my time. I will be insulted if you buy this car.’ He’s like, ‘Yeah, but I really want it. I’m going on a road trip next week. I want to take the car.’ I said, ‘Listen …