Those are massive SUV-type things with apparently rather weak engines (ie almost light hybrids, but with a plug); the typical plugin hybrid is a fair bit smalle

Those are massive SUV-type things with apparently rather weak engines (ie almost light hybrids, but with a plug); the typical plugin hybrid is a fair bit smaller. And has a bigger battery; the Mitsubishi Outlander mentioned had a 12kWh battery, vs, say, a plug-in Prius, a much smaller car with a 14kWh battery, Many plugin hybrids only need to use their petrol engine when they actually run out of power. I would wonder if whoever came up with the above study was deliberately looking for a worst case scenario, tbh; they didn't include any small/normal-sized cars at all (everything they mention is over two tonnes), even though the _average_/most typical plugin hybrid car is probably some sort of smallish hatchback. (Even then, though, I'm curious what conditions they're testing under. I know someone who has a BMW 5-series plugin hybrid saloon, which is a close relative of the X5 mentioned, albeit a bit lighter and more aerodynamic, and it operates pretty much entirely on battery when charged.)