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Glad to see you saw a positive impact on your commute, vs. not seeing anything definitive just looking at coolant temps alone.
I'd have to wonder if the Prius' magic coolant thermos was interfering with your attempt to measure via the coolant temp sensor, IE: your block heater would heat coolant that normally would have cooled off in the engine's coolant jacket. Then you turn on the key and the computer pumps warm coolant from the thermos into the system, moving your block-heated coolant further along the loop.
It'd be more difficult to figure out the net temp increase with such a system.
But I'd expect an hour and a half to put a measurable amount of heat into the car , even from a relatively low power (300w) heater - if that's what you've got.
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