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As was said above, unless the engine can take advantage of the extra octane in its ECU tuning, you're just wasting money by going above what the manual says.
My Jeep gets premium (93 both here and at home), as it has a fairly aggressive timing curve, and no knock sensors. The manual requires (not recommends) 91 minimum, and it would definitely ping on any less.
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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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