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Originally Posted by Brian Carlton
Therefore, to duplicate such a situation would require an adjustment of the ALDA.......either richer or leaner.........the direction is unknown. You'll need to experiment and determine which direction the engine prefers. I'll take a guess and say that it should be adjusted richer (counterclockwise). Give it a try and turn the screw 1 turn counterclockwise. Then monitor the fuel economy carefully over several tanks and report back with results.
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That sounds right to me. I suspect his ALDA is better "tuned" to 5000 feet than sea level. If you optimized the adjustment for your location you should be able to get similar results. I've never noted a difference between sea level and 5000 feet, but I don't keep careful track of my mileage, and there are always other variables. I doubt there is a significance difference in wind resistance, there isn't that muck difference in air density at 5000 feet.