Maps I thought about including a gas station finder, but the truth is, I use google maps for directions AND for finding things like gas stations all in one place. Because it works.
MyCar Locator Free Living in NYC, parking is a free for all battle to the death that often results in my car being blocks away from my house. I use this app to make sure that I'll be able to get from point a back to point b with little to no fuss.
Fuel Log I can track my fuel usage and mileage with little to no stress, which is awesome given the astronomical price of fuel lately. I love the stats.