Originally Posted by blazen_red_4x4

With my 31's on my non ZR2, I just keep my Garmin powered up in the bottom left of my windshield and bring the speed and mileage trip on it to full screen, works like a champ lol

Around town when my speedo shows 45, I'm actually doing about 48 per the Garmin. The faster you go, the worse it gets. On the highway when the speedo says 70, it's actually closer to 76-77ish