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I never installed a CAI because they mainly claim they are for mid to upper rpm gains. I am mainly looking for bottom end, part throttle response for towing. I've got a super chips 3865. The economy setting never worked for me, even made gas mileage it worse(14-17mpg). I run the 91 performance tune with 89(gasohol)octane. No pinging and get 18-21mpg. The towing works good, but not for mileage. It gets about the same as the economy tune. I tow a 2460# motorcycle hauler .With tow mode and not raising hell, I get 12-13.5 to the gallon.
 
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