Calcium? In fuel? They already use calcium in motor oil but not for lubricating. Its used to help keep the oil from oxidizing and keep sludge formation down.
We use FP60 in the fuel in our Accord, it runs very smoothly on it, it's an additive designed to keep fuel injectors clean and provide a little lubrication in the cylinders. We are also starting to us a very promising new fuel additive from Renewable Lubricants.