So, Elon says "Tesla will likely provide both pure electric and range extended electric drive options in the future. We refer to the latter as a REEV (Range Extended Electric Vehicle) to distinguish it from “hybrids,” which are really just gasoline engine cars with a small electric motor and tiny battery. The REEV battery in our scenario would fully cover the range needs for reasonable daily usage, but there would be an onboard generator for the occasional long trip." Lets review other places we have seen this "REEV" acronym before: Here, Darryl says: “Range Extended EV” is not just PR spin for series hybrid platform, it actually makes sense from a customer perspective. Here, GM called their Volt concept car an "E-Rev", but others suggested they like REEV better. GM definition: "A vehicle that functions as a full-performance electric vehicle when energy is available from an onboard battery and have an auxilliary energy supply that is only engaged when the battery energy is depleted." Here Volt bloggers debate the validity of the new nomenclature. Over here, way back in July, someone recommended the REEV name for the GM Volt. And here, back in June, was more debate on what to call the Volt. So, it appears that the whole E-REV, RE-EV naming is a product of GM trying to find a name "other than hybrid" to call the Volt. Looks like Tesla is following GM.