Fuelstar - the scientific evidence:
Yes, we're being a little facetious here, but there is no evidence at all to show that Fuelstar either should, or does, work.
In the unlikely event that Mr Cornelius permits testing of the device, nobody's going to bother even looking. An unknown reaction producing invisible results isn't usually a cause for much research.
Here is the scientific opinion of actual scientists and engineers on Fuelstar
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Other bits of pseudoscience pretending to save you fuel: