When I got passed by flying Prii in the past I used to think 'My Nissan uses less fuel than your Prius'.
Now that I know them better, I'm not sure that was true. You get
decent economy in a Prius even at speed. Not
great, but probably better than my struggling old Nissan driving slow.
No doubt the 4th gen does even better.
Nowadays as I drive my Insight it is no contest - if you speed you lose
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.