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Wait, you haven't been data collecting using Torque?
If you're going to take the time to carefully document your changes, which I'm very appreciative of, you should use the best tools you can. An Elm237 can be had for like $8, any Android device will work, and Torque Pro is maybe $10 (should you choose the legitimate route).
Onboard info systems tend to massage data rather than give you the raw data. Torque PIDs often give you access to the raw data.
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