If you have a diagnostic tool that gives real-time info, here's what you do:
Jack the car up on jackstands, put the car in gear, accelerate to a pre-determined speed, using the diagnostic readout as your guide, then stick the needle back on. Much safer than trying to do it cruising down the road, but not helpful at all if you don't have a diagnostic tool.
• See, you think I give a ••••. Wrong. In fact, while you talk, I'm thinking, "How can I give less of a ••••?" That's why I look interested.
• I know there's a god, because every once in a while someone whispers in my ear, "You're my favorite!"