These engines will run at higher altitudes, just not like they do at sea level. I agree, if I were to move to Colorado Springs, I would have the jets changed and suffer poor mileage at lower altitudes.
These folks are just 'passing through' and can live with sluggish response for a week or two. If they were to race their cars on a track, the a re-jet would be needed.
My carb'd VW, BMW 2002, and BMW R90S were all driven to the top of pikes peak. The only problem I had was the prop shaft boot on the bike expanded to almost bursting point. It went down as I rode down the mountain.
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My back feels better when I sit in a Volvo seat
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