Historic data from my 10 year old Cavalier, until it encountered costly repairs:
A close up of the data at the end, showing my new corolla stats:
Using the old data, I was able to keep a close eye on how my driving habits influenced my gas consumption. Information allows informed actions, this simplest of data is the cause of a lot of wasted efforts addressing the wrong problems and coming to even more wrong conclusions. Next on my list is a wifi temperature network for the farm house.