Here's a 2012 article, stating that Massachusetts, Virginia & Washington D.C has pump accuracy programs:
https://www.nbcwashington.com/news/l...140666363.html
My Washington state has a weights & measures program, but someone stated that one pump they had used (& figured it to be measuring in the dispensor's favor), had NOT been inspected for 8 years. So the program in WS is in effect, null & void.