Soldato
I remember seeing a few people mention apps that they use to track how much their cars cost them. I may just be confused and it was a fuel calculator though. I either way I'd be interested in finding out what you use.
On Android i like FuelLog. Free version does about all i need.
I use this as well, spot on
Fuelly it another one that people use, not sure about apps, I'd guess it does have them though.