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Message: [QUOTE="wooner, post: 145595, member: 1611"] Ok. Found out something interesting. When I first noticed the negative boost reading, I was in Helena Montana which is at about 4500 ft above sea level. I live in Portland Oregon which is about 250 ft above sea level. On my drive back to Portland today, I noticed the gap between the two gauge readings getting closer and closer as I got lower in elevation, and when I got back to Portland, both gauges were reading the same again, so apparently this negative reading from the map sensor had something to do with altitude. Not sure how, but everything is back to normal now. I would be interested to know if that has something to do tuning and what the individual tuners write in their programs for trucks at different altitudes. [/QUOTE]

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