Does anyone have verifiable Throttle Body Spacer data?

I searched this "forum" and found there are more than many postings on TBS, but none with actual Dyno data and or other factual, reliable, data.

Also, I've spent a good deal of time researching TBS and find mixed results but a consensus there may be a 1 - hp gain; maybe 1-2 mpg.

Anyone on this forum have reliable TBS research