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Pete Meyers spotted and posted on Twitter a screen shot of the Google local 3-pack showing gas prices. I cannot replicate it but it seems Google is showing real-time has prices of nearby gas stations.
Here is a screen shot:
Google has shown this data in their maps app and other areas. So I guess it makes sense to show it in the local pack. It is always nice to know where you can save a few pennies here and there, especially in states where gas prices are very expensive.
This seems to be a limited test, as I cannot replicate it.
Forum discussion at Twitter.
Update: I now see it myself, here is a clearer screen shot:
