The hack itself is a low-level one, where the BMW i3 REx has been classified as a zero-emissions vehicle due to the rules from the California Air Resources Board. The reason behind such a categorization is due to the fact that the miles clocked up by the gas-powered range extender are more or less similar to the single-charge range of the vehicle’s battery, and some folks have managed to tweak the software in a way that enhances its capabilities.
In other words, one can now pump in 2.4 gallons of gas rather that 1.9 gallons prior to the hack, which will translate to approximately 20 more miles of driving range. Not only that, the i3 REx’s software has long ensured the suppression of AM radio due to potential electromagnetic interference from the electric drivetrain, but this low-level hack is capable of reversing such an effect.