Hybrid technology does absolutely nothing for the highway milage. On the highway at constant speed cruising, the electrical machine is off and the only thing that determines the gas milage is the gas milage of the engine at the speed you choose. As a matter of fact, because you have to carry the electric machine and the battery pack, this car might actually get worse fuel economy than if the vehicle had the same engine but is not a hybrid.
A more relevant metric is what is the gas milage on pure local driving. That's where regenerative braking, engine off during idle, electric launch can really help the gas milage, WITHOUT compromising drivability. If i'm not mistaken, the vehicles you listed are classified as mild hybrids where the battery pack is relatively small. So the engine is not downsized significantly. Therefore there's even less chance for improvement in terms of highway driving.
graduate research associate
Center for Automotive Research
at THE Ohio State University
2004 Intrepid SXT