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Our test benches run expensive (accurate) dynos that are calibrated very accurately, and v expensive fuel measurement systems, along with fuel conditioning to hold temperatures accurately (40degC +/-0.5degC). This last point is critical as variation in temperature changes the fuel density and therefore the measured flow into the system. The air is supplied at controlled conditions (25DegC and 40% relative humidity, from memory).
Even with that, and with our dynos at sea level we then correct for atmospheric conditions.
Personally, I don't think you could get anything meaningful from an OBD measurement - sorry!
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