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I've been running Pulsestars for months. They work well but my testing isn't rigorous enough to detect differences that small- if there are any.
I got the impression they are a pretty straight-up outfit. They sure have endured a lot of crap. That said, I don't know if the product would ever pay for itself in fuel savings. I'm so cheap I KNOW I'd never spring for 'em on my own unless the savings were proven and significant.
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