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Old 07-21-2010, 09:24 AM   #16 (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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With 8+ psi of boost, even with the low compression (although it depends on the cam somewhat), you'll probably start pinging before you overshoot the optimum timing.
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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