FYI, the owner/representative of the product in question has commented below the blog entry, taking Ben to task for misusing his voice in leading readers away from the "Truth" (yes, of the capital "T" variety) regarding this device.
Goes without saying of course that I'm also highly skeptical.
I'd simply say to any company that markets a gas saver device in the U.S.:
don't even bother talking to me until you've subjected it to (and seen significant results from) the EPA's approved testing regimen for fuel saving devices.
EPA Motor Vehicle Aftermarket Retrofit Device Evaluation Program
It's that simple. Testimonial evidence from customers isn't worth squat.