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Old 07-16-2010, 05:59 PM   #12 (permalink)
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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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JeepNmpg2 - That's because if you kill the ignition without taking the tranny out of gear, you're just forcing DFCO. The engine is still spinning, as is the tranny pump. The tranny doesn't know or care that the engine isn't still running. When you turn the ignition back on, the fuel and spark comes back, and the engine continues running normally.
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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