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The only way to disable a cylinder that will actually reduce fuel usage, would be to stop the valves from opening on that cylinder, either by removing rockers or grinding the lobe down or what not. You would also obviously want to disable the injector after you do that. There was a guy who had an old junky fiat that spun a rod bearing so his solution was to remove that rod and the one next to it, weld the oiling holes shut, then grind the cam lobes down. It was carbureted so nothing needed there. He said he picked up something like 15% fuel economy. There's videos of it running out there on the youtubes.
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