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"For short trip city driving, you are increasing the thermal inertia, making the engine take longer to warm up (even if you start from a higher point), meaning more time below efficient operating range. And yes, added weight makes a significant reduction in stop and go driving."
I'd leave the thermostat in the circuit, to only allow cold water into the engine side under the same terms as water from the radiator. Drawing water from an insulated full-hot tank could help return an engine to efficient operating temperature after parking without a block heater, which could be good practise year-round. (Of course, the oil pressure accumulator is even easier, and seldom implemented. It saves gas in the parts-delivery aspect of car ownership.) For stop and go traffic or hills, regenerative braking would help handle the weight.
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