Nice! Looks like you have a good thing going, especially since you've been able to increase your speed.
There isn't anything you can do through the Scan Tool, or a setting you can change, but you can adjust it with your right foot. The OLM will adjust the posted number based on city driving, highway driving, jackrabbit starts, oil temperature, outside temperature, things like that. Perhaps fully adjustable may not be the best adjective, but the OLM will account for and adapt to changing conditions, oftentimes many (if not all) that can be altered by you.
Like with Clyde, during the winter I notice the OLM drops when the weather is particularly cold, or when I commute to work more times than not. In the summertime it will increase, as the weather improves, and I go for long drives (where there's less stop and go involved).
Speaking of which, here ya go Thought nobody would ever ask