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My own Previa is supercharged, so it doesn't seem to gasp for air like my '01 Corolla does at the same altitudes-- it's pretty much like a turboprop airplane at 30,000 feet getting all the air it needs to run properly but not having to fight the air resistance.
Looking at Orange4Boy's quick-glance profile by his posts, I would actually guess that his Previa is not supercharged, seeing as S/C started as an option with the '94 models and then was standard on the '95 and later. Maybe his mileage will go down after all, or stay close to the same.
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