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12 unit Apartment building has been running 3lb plus forever, I recently had a Weil McLain LGB 6-23 put in, it was expensive and installer (50 year pro) put in 0-30 gauge a Pressuretrol that didn't go below 3.2 lb. (why did he do that?) my NG bills are always higher than what other buildings are. After reading here and Dans book, Lost Art of steam I've been on the quest of low pressure for efficiency and heat balance. I just installed a honywell Vaporstat and 0-3lb gauge, I'm running at 12 oz, cut out, 6 oz cut in just fine. Yes I can go lower I've tried it to 6oz cut out, but balance is an issue different radiator venting may not cure. I still get like 2-3f swing so maybe thermostat needs to be set to cycle narrower. My question is, I have not seen charts, or numbers relating to how much lowering each OZ saves in energy $, its time consuming lowering pressure and rebalancing the system. Is there a "maximum efficiency range" that is only a % or two different? Can lowering pressure be given a % saved per lb. lowered? Presently the Vaporstat cycles 3-4 times per boiler run at 25f outside. In Chicago thanks all.