Actually, they also do better in city because they shut down the engine whenever they are stopped. Slower is almost always is more efficient, but for regular cars the better efficiency is lost because the engine runs when it isn’t needed. The hybrids shut the engine off, saving tons of energy (unless you drive with a heavy foot).
Still, nobody was getting 60 in the city. I find my city/highway are about the same.
For every car in every situation, there's a sweet-spot speed at which below or above that you're actually getting less efficient.