To make a difference in fuel economy it would need to engage, as any time your brakes engage it hurts fuel economy. However, it will only engage when the car-puter senses an unsafe condition and you would want it to kick on because it just might save your backside. I strongly discourage people from deactivating a safety feature on your truck. I have never had my sway control engage even when I have experienced some minor sway towing the SolAire. I believe that these safety features will only engage when they really need to and that is when I want them too. Fuel economy be damned if it is at the expense of myself or my family’s safety!
SPPD