I'm a firm believer in chips and programmers. Have owned many sports cars and motorcycles and can attest to the differences. They make. My buddy ho has a giant Dodge truck with 35's got better gas mileage with a chip and oversized tires than stock.
However, it seems to be a money waster with Jeeps.
Want power? Supercharge it. Want better gas mileage? Drive it like a low geared truck, not a car.
'06 Rubi Unlimited, bone stock...for now. 3" Zone lift waiting for time to install
'94 Mitsu VR4, highly modified twin turbo
'71 Stingray convertible, number matching & mint
"I'd rather laugh with the sinners, than cry with the saints..."