Okay... Progress on the MPGuino code is as follows: I've added an overall Menu page, similar to what
josemapiro suggested with
his PowerPoint example. I've started changing the Parallax 5-position button programming to be more like that PowerPoint example, too. This will enable me to add the A-B test viewer, as well as the coastdown test. I simply could not add any more button-press combinations, otherwise.
The Menu page is accessed by pressing <UP> on the Parallax 5-postion button, or by pressing <LEFT> and <RIGHT> together on the traditional 3 button setup. The Setup page, which used to be accessed by these button press combinations, is now a Menu page entry.
As with all other displays, the MPGuino code will continue to reliably gather fuel and distance information in the background. This is different than, say, the UltraGauge - The UltraGauge user manual clearly states that fuel consumption information is not gathered while a menu is displayed.
The beta is posted here - once I have refined it, hopefully with input from one or more of y'all, it will be posted at the first post of this thread.
Update: The current version of my MPGuino code may be found here.