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Old 12-10-2010, 11:01 AM   #8 (permalink)
comptiger5000
Master EcoModder
 
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Join Date: Feb 2010
Location: CT, USA
Posts: 544

RaceJeep - '98 Jeep Grand Cherokee (ZJ) 5.9 Limited
90 day: 13.62 mpg (US)
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Warm air intakes help simply because they force you to open the throttle plate further for the same amount of power, leading to lower pumping losses. They don't help every vehicle though. I used to have a Hyundai Elantra (2000) for a bit. I tried a WAI, and the mpg dropped from 18 city to 16, and it pinged like crazy (this was in winter). Needless to say, I un-did that mod.
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Call me crazy, but I actually try for mpg with this Jeep:



Typical driving: Back in Rochester for school, driving is 60 - 70% city
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