Here you have the fuel consumption (fuel economy) of BMW i8 Roadster Plug-In Hybrid 2018/2019/2020 (1.5 l R3 petrol engine + electric, 275 kW, 374 HP, 6-speed automatic gearbox for combustion engine and 2-speed automatic gearbox for electric engine, 4WD) in city, highway, motorway and autobahn.
Results:
Electric only range: ~45 km km (~28.0, mi) in a city

Results with almost empty batteries:
eco city: 6.3 l/100 km (37.3 / 44.8 mpg US/UK)
90 km/h (56 mph): 5.1 l/100 km (46.1 / 55.4 mpg US/UK)
120 km/h (75 mph): 6.7 l/100 km (35.1 / 42.2 mpg US/UK)
140 km/h (87 mph): 8.0 l/100 km (29.4 / 35.3 mpg US/UK)
very fast driving: ~20 l/100 km (~12 / 14 mpg US/UK)

Results with fully charged battery on start of a city trip:
50 km distance: 0.3 l/100 km
30 mi distance: 1067 / 1281 mpg (US / UK)
75 km distance: 1.9 l/100 km
45 mi distance: 133 / 160 mpg (US / UK)
100 km distance: 3.5 l/100 km
60 mi distance: 71.8 / 86.2 mpg (US / UK)

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