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2007 Jeep Grand Charokee Limited 5.7 Hemi

Discuss Predator 2 for Chrysler vehicles

Moderator: sohfast94

Post Thu Dec 06, 2018 12:20 pm

Posts: 15
I live in California and put a K&N Cold Air Intake and a MagnaFlow exhaust on my 2007 Jeep Grand Charokee Limited 5.7 Hemi. I had just purchased it used and didn't check my mileage before adding the 86 octane tune. Now, with mostly city driving, I only get 9.3 mpg. Should I try putting 91 octane gas in and change the tune to 91 octane? If anyone has had this bad of mileage, I would appreciate any help.


2006 Dodge Magnum SRT-8, Inferno Red, Option Group 3
Mopar CAI, Custom 3" CAT back exhaust
Vortech V3 Supercharger
RWHP=530.5 RWTQ=510.25
GRC Performance DynoTune, Custom CMR

Posts: 56311
Location: DiabloSport World Headquarters

Id give it some time as the DIC may be off for a bit.
If it doesnt come up, put it back to stock and see what its like...if its low stock there may be a mechanical or tune up issue that needs to be addressed.
Mike Litsch
Powerteq Customer Service Manager
Diablo Tech support by phone:
M-F 8:00 AM to 5:00 PM EST

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