Recent developments reveal that the fuel tank capacity of the i3 REx was not physically reduced, but rather controlled via software. This was accomplished by shutting off the fuel pump at 1.9 gallons.
What does i stand for in i3? 5,000 mile BMW i3 ownership report
2017 BMW i3 Review, Ratings, Specs, Prices, and Photos - The Car Connection
2017 BMW i3 Review & Ratings
U.S. BMW i3 REx Actually Has 2.4 Gallon Gas Tank, But Clever Software Limits Fueling To 1.9 Gallons
Why BMW i3 Owners Have Been Building Potentially-Dangerous Gas Tanks Into Their Front Trunks - The Autopian
Why BMW i3 Owners Have Been Building Potentially-Dangerous Gas Tanks Into Their Front Trunks - The Autopian
Report: Apple in negotiations to use BMW i3 as basis for its own electric car - 9to5Mac
Used 2014 BMW i3 For Sale at Mac Haik Ford
BMW i3 REx Electric Car: 'Coding' Unlocks Features Owners Want (And May Void Warranty)
2017 BMW i3 Price, Value, Ratings & Reviews
So here is what a BMW i3 electric Motor Looks Like (removed due to a Power Electronics Recall) : r/Justrolledintotheshop