Independent fuel test lab in midwest?

[cad]

I'm looking for an independent test lab to compare two race fuels that I've used recently. I recently ran 2 fuels back to back and one of them was like I must have put in mower gas.
I will not name mfg's...just looking to send in samples.
Any information on one located in the Midwest would be appreciated. The one that come up on google, like Intertek only do testing for business.

Thanks
Clark