I'm not totally sure either, but my company car is a RAV4 hybrid wit gas/electric. The meter on the dash tells me when the motor is supplying power to the wheels or wheels are supplying regen to the motor's battery.
It accelerates pretty quickly, so I think the motor helps in this situation, and I see it kicking in under certain cruise situations.
Initially, I wasn't a fan, but it is rated for 40 MPG and a 500+ mile range. If Jeep offered something similar, I would consider a hybrid, but I don't see where they could put the motor and battery.