Hybrids don’t use brakes to slow down, unless you stomp on them. The motor-generator recharges the battery instead, applying reverse torque.
There is the extra weight, but you have to subtract the weight of a tank of gas.
But the energy would have been dissipated in the brakes and heat is used to charge the batteries.
150-200 pounds all-up fuel and tank for 20 gallons.
Tesla 85Kwh pack weighs ~1200#’s.