This will depend on your driving. I noticed a slight increase in fuel economy in city driving--mainly because I wasn't having to put as much kinetic energy into the car to reach a certain speed, and therefore less kinetic energy was wasted braking.
On highway driving you'll notice next to nothing, and probably nothing on hybrid cars as well that can recapture that energy.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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