Reasons for wanting on are pretty basic really. I want to record my driving, with the ability to see real-time fuel mileage, average speed, sensors, read and clear codes, and the ability to lean out the fuel. With lots of emphasis on the last one. I've been getting some piss poor fuel mileage and I want to see where everything is at to see if that is something that would help me out or not. I've been eying the ScanGauge II lately, and that would be a great tool to have for most of the other things... but I don't believe it has the ability to lean out the fuel at all. Just clear codes and gives most of the other main things. The thing is... I don't have a laptop, so something like the AutoEnginuity (or similar) would be out of the question. Unless there is something out there that I can plug into my car, take it out when I am done, and then plug it into my PC at home, then back to the car again. What are some other options to look at?