Welcome to Ecomodder, TonyB!
I'll attempt to answer your questions to the best of my abilities. Others will chime in and correct me if I am wrong
1. This will not affect the readouts. The SG uses complex algorithms to determine your fuel economy, along with reading from the MAF, MAP, O2 sensor, TPS and others.
2. I see what you are getting at. But, the SG calls for the exact engine size, so if you have a 2.0, then input a 2.0. It can read Boost Pressure and different MAP/MAF readings, so it will be on top of things
3. The best I can remember, vehicle weight is not needed for the SG.
4. The SG calls for 3-4 over your
idle tps. You would want to register this reading as 10 or 11. When you are coasting in Neutral, your engine is idling, right? So that is the measurement you want to go from. Unless you are Engine Off Coasting (EOC), then that value has no meaning
5. Yes. This procedure is to get the SG accuracy dialed in. It will be ballpark at best without calibration. It is still useful, but if you are like me, you want real time data. Doing the calibration will provide that!
Don't hesitate to ask anymore question, Tony. We love helping out around here
