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Okay, gotcha.
So to my as of yet fictional data-gathering rig, in addition to OBD II, injector pulse rate (and derived MPG), rate of climb/descent, ambient temp and manifold vacuum data, I need to add barometric pressure and humidity.
That's all do-able, eventually. The real pisser is a real-time way to measure wind speed and direction, subtracting out that generated by my own movement. Must be a way, I think they do this on sailboats...
(Don't look for most of this before next spring, though, at the earliest.)
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