I agree with Lew, seems like a comparison to non-hybrids and stated gas milage is warranted.
Also, common sense needs to come into play here. If you drive your car at 65+ to work everyday, your milage will always be worse than driving at 55. I take a 30 min trip to work through mostly farmland, I can take back roads at 50 or the highway at 65. I notice the gas lasts a lot longer if I take the scenic route in my '96 Saturn. I haven't measured it, but I must get 5-10 more MPG at that generally lower speed.
Not everyone can choose how fast to drive to work or school (some places going slower than traffic can be bad for your health

), but conservation doesn't need an electric motor to be viable.