A Toyota Corolla with a 1.8L engine requires 6.2 liters of gas to drive for 100 kilometers on a highway. But on city roads, it would require 7.9 liters of gas. A 2022 Ford F-150 requires 9.4 and 12.1 liters per 100 km for highway and city driving, respectively.
I’m guessing this is mostly because ICE vehicles waste more energy in town (due to braking loss, and engine inefficiency), than a problem with BEVs.
BEVs claw back the losses in town, meaning that only the simplest inefficiencies are left (v=ir2/2 with the wind and tyre resistance, and maybe a little bit of hot components reducing efficiency).
Those same highway inefficiencies are masked in ICE vehicles, as the efficiency is much lower during urban driving to begin with.