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I don't think the 93 vs 91 maps are that different from each other, maybe a few percent either way but certainly not a few MPG's.
Switching to the 91 map may prove cheaper if only because 91 octane might be cheaper per gallon than 93.
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2011 E90 335i xDrive: MHD S1 Plus, XHP S2, VRSF 7in. FMIC and CP
2004 Jeep Grand Cherokee: 4.0L I6, 2in. lift
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