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Old 06-01-2010, 11:25 PM
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Tuners, with an 87 octane tune, will improve mileage some.

The Predator does add fuel but it also removes a lean running condition (on the HEMI that's 13.X air/fuel ratio or higher number) down to a WOT air fuel ratio around 12.5. So, yes, it does richen the mixture but also prevents knock and knock retard, which in my opinion are not good for your engine.

If you are looking at a MPG gain, check out the SuperChips tool. They have an 87 octane tune which will richen the mixture less but may give you the MPG gain you are looking for.
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