Top Average Speeds

The top speed of rollercoasters are selling points for marketers, and of course the top speed is to be found at the bottom of the biggest hill. But, what about the coasters with the top average speed for the entire coaster layout? I'm don't think I have ever heard this subject discussed. My experience with Steel Revenge at Cedar Point makes me wonder about its average speed since so much energy is carried throughout the ride. Some of you may be headed out to ride Iron Gwazi and this might be something to keep in mind on this newest RMC creation. Oh, if this is discussed in other posts, please direct me to those spots as a search for the term "average speed" came up dry.