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The deal with BMW and when you can engage the REx depends on the ability to use the HOV lanes in certain states based solely on being an electric or not and a single passenger. So, to retain that capability, you can't manage when the REx turns on as you could be running it while in the HOV lanes, and that negates the electric only provisions of how the law is written. It would be much more useful to be able to run the REx say when on the highway at speed even with a full battery, and then run around in the city in stop and go while on full electric, but while you can do that in other parts of the world with the i3, you can't in the USA because of the laws involved, and their desire to make it use the HOV lanes to commute. There may be a software tweak to override that, but it will not be an approved mod in the USA. As it has been reported, the battery reserve has to drop to something around 18% before you can activate the REx in the USA. Elsewhere, you can turn it on any time you think it may help your situation.
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