The Prius pack is right around 1kWh, you are correct. However, You can only charge up to 80% before the motors will just start spinning the engine to bleed off power, and you can only discharge it to 55% before the engine kicks in to recharge the pack. I know these numbers because I have an enginer PHEV kit in my Prius and I have a Scangauge II with X-gauge features to allow me to monitor battery SOC. So, out of your 1kWh you can only use 25% or 250 Wh. At most that is going to get you 1 mile. My personal experience is you won't even get that much.
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