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The FVT is a two seat vehicle, so compare it to the Insight?
The Volt is not an ideal series/serial hybrid: it does NOT run in charging mode, but instead varies the RPM to provide power to the motor. It only goes into parallel mode when it needs more torque than the two electric motors can provide, and it weighs a lot more than it should. It is not an optimized EV -- and a good series/serial hybrid has to be an efficient EV.
The Volt uses 176-352wH/mile (8.8kWh / 25-50 miles range), while the eVaro uses 133-160wH/mile (~20kWh / 125-150 miles range). The Volt uses ~8-9 gallons to go 300 miles in charging mode, while the eVaro uses ~2.2 gallons to go 300-375 miles, so if we double that to move 4 people, it is still at least 2X better than the Volt.
Do you see a pattern here?
MPGe is not controversial -- it is repeatable and merely a conversion spreadsheet to compare energy use in various vehicles. We are not comparing carbon used (emissions), just energy used. Besides, the electrical use of the two can be compared, and the ICE mode can be compared separately if you want -- MPGe is just the simplest way to combine everything to a common denominator for an overall comparison.
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