The BMW i8 can go from 0–100 km/h (0 to 60 mph) in 4.4 seconds and has a top speed of 250 km/h (155 mph).The BMW i8 has a fuel efficiency of 2.1 L/100 km (134.5 mpg-imp; 112.0 mpg-US) under the NEDC test with carbon emissions of 49 g/km.he 2015 model year BMW i8 has a 7.1 kWh lithium-ion battery pack that delivers an all-electric range of 37 km (23 mi) under the New European Driving Cycle (NEDC). Under the United States Environmental Protection Agency (EPA) cycle, the range in EV mode is 24 km (15 mi) with a small amount of gasoline consumption.