I disconnected the ps on the insight which is electric and gained 3 mpg. It wasnt too much difficult to steer than before.
As for water, you dont want to do that as it will generate hot spots and maybe even stress. Frankly, not sure you can guess when it should be off or on.
An insight owner did away with his mechanic pump for water and used a solar hot water one on electric. It ran at a lower volume and I understand it worked well with the cooling system and antifreeze in it.
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