SmartFuel App
Ok, I want to love this app, but I don't... yet. As a guy who is responsible for engagement and usability for a lot of companies, the first time use of this app was a bit confusing (but the potential for awesome is there).
** BAD NEWS **
It made assumptions about gas tank size and a few other things instead of asking me, which I personally would have preferred. Without the user knowing these variables are set for you, the concept of "save this much per fill up" is hard to understand, because there is no point of reference.
The second thing that bothered me was the routing feature. I defined a route from Nashville to Knoxville and it found 50+ stations -- but they were not in order. #1 was in Nashville, #2 was half way to knoxville, #3 was back in Nashville, etc. Would have been nice to see them as I traveled along the route.
** GOOD NEWS **
On the bright side, knowing the price difference exists and how much potential is there to save is HUGE, especially for people who travel a lot. Withe a few tweaks, I can see this being a very powerful app that could save people a lot of money.
Disclosure: I am friends with the developer.