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Valves open the same, yes, but the throttle plate is closed, causing the engine to build a significant amount of vacuum (more than any other normal condition). The effort of sucking air past a closed throttle plate is what provides the engine braking effect during DFCO.
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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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