Boy, the display really has another unexpected value for me. I learned of the difference between Tier 1 and other qualities of gas through this board. Because of this I've made it a point to primarily fill up with Tier 1... but sometimes you just can't and you have to take whatever you can. I've found the display lets us see immediately that lower quality gas destroys MPG significantly. I never had a clue it would make such a difference... but with the display you can see the difference right away.

I've literally found it drops 4-5 miles off our MPG.