One problem we have with motorcycles is there aren't as many being tracked as cars. So there are some differences between the two.
If we have enough data, we do show the graphs. Here's a model page with a graph of averages:
Honda vfr800 interceptor.
We like the graphs better than a single number because it gives you a better feel for the range of fuel economy people are getting. And you can get a quick sense of the most common average by looking at the highest point on the graph.
Is that what you were looking for?