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Shave the water pump
Not save it, shave it, the impeller blades. Odds are none of you are going to do any racing and even with reduced flow it would be more than adequate on a hyper miler. It would help increase warmup time to the cylinder, and it would be substantial savings not having to move the coolant around as much. Think of I as a water pump, if it can flow 1000 gallons a minute to keep a car cool on the highway in the desert without aero mods then a educed fuel efficiency vehicle would need half, 500 gallons a minute.
Or remove the belt and run it off of an elctric motor with variable speeds
Sort of like adding an under drive pulley but a bit more extreme.
Easily tested, warm up an engine and check on scan gauge how much fuel is consumed. Remove Belt and test again
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