Although there's similar applications on Google Android Market, I like to keep my fuel records here due to good-looking page layout and color.
A little suggestion is here in Taiwan we're used to say "how many KMs per liter" instead of "how much fuel per 100KM". It'd be nice if there are options for users to choose.
Its been discussed a whole lot on here. I'm sure its in the FAQ somewhere. The reason the admins don't do KM/L and stick to L/100km is because the later is an international standard.
I know its counter-intuitive to how the US uses Miles Per Gallon (Versus Liters per KM to which you're accustomed to), but I strongly suggest switching your thinking to Liters per 100KM.
When thinking of it this way, the lower the number, the better the mileage.