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Anybody out there tried or know of anyone who has used the hypertech e-con for their 5.9? I'm trying to get some better mpg without having to run premium fuel (and superchips flashpac fuel economy setting is only for the hemi's that I've found so far). I found this programmer on ebay (sorry i'm not pc savy enough to give you all the link) and they claim better mpg using only 87 octane fuel.