I don't think the LH-Jet generations used in RWD Volvos were this sophisticated. The 850/S70, yes, has some adaptive programming. The system you have doesn't.
The probable cause of better running: buying the fuel sold locally. It has to have a higher vapor pressure to deal with the reduced atmospheric pressure at the higher elevations. It took a couple weeks for you to burn all the old "sea level" fuel left in your tank and replace it with the high altitude stuff. The fuel vendors formulate a bit differently based on market. In essence the stuff sold there has a higher octane rating, though it's not expressed as such.
As with any Volvo, it'll probably benefit from a good throttle body cleaning and a flame trap service, as well as a tuneup if it's been 25K or more.
Good luck with it!
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Rob Bareiss, New London CT ::: '87 244DL/M47- 230K, 88 744GLE- 220K, 82 245T-181K Also responsible for the care and feeding of: 88 745GLE, 231K, 87 244DL, 239K, 94 855GLT 189K
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