# 2018-2022 BMW i3 REx 120 Ah The BMW i3 REx (Range Extender) combines electric driving with gasoline backup security. Its futuristic carbon-fiber construction, rear-wheel drive, and nimble city handling make it uniquely BMW. The 120 Ah battery provides approximately 126 miles electric range, while a small two-cylinder gas engine adds roughly 90 miles as a generator. Enthusiasts praise its premium interior using sustainable materials, instant torque, and go-kart-like agility. Critics note its quirky styling, narrow tires, firm ride, and cramped rear-hinged back doors. The REx engine is infamously small—some consider it underpowered for sustained highway driving. **Best for:** Urban professionals wanting electric commuting with occasional longer trips, eco-conscious buyers seeking BMW's unique take on sustainability, and drivers who appreciate unconventional design. Its compact size excels in city parking while premium appointments satisfy luxury expectations.
The i3 REx combines electric simplicity with a range-extender engine requiring premium gas and occasional maintenance. The 120 Ah battery pack is reliable, but out-of-warranty replacement costs $15,000-20,000. Insurance runs higher than average due to expensive carbon-fiber body repairs. The REx engine needs periodic running to prevent issues from disuse.
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