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Just based on their marketing, I wouldn't trust it. Each 'level' claims more HP *AND* better fuel mileage...
They claim it will not void warranty: "Absolutely not. Our tuning chip will not void any warranties. If you have a very strict underwriter on your warranty you can simply unplug the unit before taking your vehicle in for service with no traces and install it later."
IMO you'll get better mileage increases by adjusting your driving style.
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