Here you have the real-life test of fuel consumption (fuel economy) in Mercedes-Benz E 300de (2019/2020, Plug-In Hybrid: 2.0 l R4 turbo diesel (143 kW, 400 Nm) + electric engine (90 kW), RWD, 9G-Tronic) in a city (also in heavy traffic) with almost empty batteries - in case you forgot to charge batteries before the city trip. Total system output: 225 kW (306 HP), 700 Nm, RWD, 9G-Tronic. Results: 5.5 l/100 km (42.8 mpg US / 51.4 mpg UK).

Mercedes E300de Electric only range: ~44 km (~27 mi) in a city:    • Mercedes E 300de electric range (dies...  
Mercedes E 300 de fuel consumption (economy) tests in other conditions:    • Mercedes E 300de - fuel consumption (...