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.
This isn’t really new info, this was even the case for the 1st gen Prius over 20 years ago. It can be counter-intuitive for folks who are only used to internal combustion engines.