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Old 06-15-2009, 12:55 PM   #10 (permalink)
MazdaMatt
Master EcoModder
 
Join Date: Jun 2008
Location: London, Ontario
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2k2Prot5 - '02 Protege5
90 day: 33.82 mpg (US)
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I'm sure you still hear the engine. They have just deadened out the "annoying" low frequency sounds associated with a lower idle. You'd need a really high-tech system to completely eliminate engine noise. It'd cost as much as the car.
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