The RAV4 is a bit of a pig, it wouldn't be a usable pure EV at 16kWh. (Needs 4-5 times that)
The drawback for earlier PHEVs was higher battery degradation, the Outlander being perhaps the most famous for this, how are the newer ones?
Perhaps ironically, the best new tech for PHEVs is Teslas tabless batteries
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)