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Old 12-26-2010, 10:14 PM   #16 (permalink)
comptiger5000
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Join Date: Feb 2010
Location: CT, USA
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RaceJeep - '98 Jeep Grand Cherokee (ZJ) 5.9 Limited
90 day: 13.62 mpg (US)
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I did a little research, and while strange, it sounds like that was done in some cases for either EGR, or to improve shutdown smoothness, and possibly for engine braking (like an exhaust brake on the intake). It's not common, but Toyota, Nissan, VW and Mercedes have all done it at some point, mostly on old designs.
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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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