Ok so nothing scientific here, just a basic test.
Did a trip this weekend (370km return) Same km there and back, same roads, same temp, very similar traffic, lots of hills and no congestion so travelling at max speeds allowed (100kmh), a few towns, some 80km and 50km zones.
Trip there.
Battery full when departed. Temp. about 17C. Climate set at auto 22.5C and not touched. ACC not used. Feathered accelerator to keep in green zone as much as possible. Used B0-B5 as much as possible. Battery to 40% before hitting save. Resaved battery after decents. Did not use charge mode. Arrived at destination with 1 bar on battery. Fuel used 6.8l/100km
Trip back.
Battery full when departed. Temp about 18C. Climate set to 22.5 and not touched. Used ACC as much as possible and just left the car to do its thing, no save, no charge, no B0-B5 and just D. Arrived home with no bar showing on battery. 5.8l/100km.