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That engine output graph is just for maximum output at a given RPM. We also need information on part-throttle operation, and efficiency. Rather than research all the engine types, and estimate their state of tune, it is probably better to interface with the MPGuino data. From that, and the GPS position data, a rough guess at elevation changes could be made. Adding an accelerometer would help with accuracy and filtering out wind effects. I wonder if you can get an input for current weather data to check on wind, rain, snow, temperature, etc.
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