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I'd love to see testing done on here, especially with people doing creative work you don't see on production engines. Fuel economy results speak for themselves, especially if you log everything and report honestly. I have logged every drop of fuel I've burned in any of my cars for the last ~13 years, and I try to be conscious of my confirmation biases.
For the moment, I'm content with the hundreds of thousand hours of testing already published on the topic. Engineers, manufacturers, the US EPA, EU etc see the the ~twentieth of a percent of fuel typically measured as makes it through an engine unburned as a problem.
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