Electric cars are much better for use in closed environments like tunnels, due to their extremely low chemical emissions.
That is not too important today, because most streets are in open environment. But in densely populated areas ground prices go up, while building underground structures gets cheaper due to scientific and technical development, so i expect more streets in tunnels in the future.
Cars could be constructed to drive much more efficiently in tunnels, because there are almost no weather effects: No rain, no snow, no icy or wet road, no lateral winds. The streets surface (without the need of being resistant to weather effects) could be constructed for much less Rolling Resistance
, the tyres could cause less Rolling Resistance
and drag, and the cars hull could cause much less drag.