They showed the car. It was run on what looks like a dyno roller rig.The facility mentioned is in Clinton Township in New Jersey:
ExxonMobil Research and Engineering - Clinton
The article makes it clear that the run was on an actual vehicle on pavement, not an engine on a test rig (unless the lab is large enough to allow a 500k 65 mph run or the 2015 Toyota Camry was miniaturized).
The Center has both labs and test tracks and was recently expanded in size.