Gasoline is a mixture of the alkanes and unlike many chemicals, can be stored for long periods and transported without problem. It is only when ignited that it has enough energy to continue reacting. This property makes it difficult for alkanes to be converted into other types of organic molecules.
Recovery from being spayed is usually around 10 days. My kitten was back to her usual self in three days but it took 10 days for the incision to heal enough for the stitches to come out.
Spaying costs vary depending on the cat. If the cat is pregnant and you want to get her spayed during delivery (if there is a complication and this is a risky one so doctors will quote a good price), exotic breeds and spaying a cat in heat. I have an Indie cat and I got her spayed at 4 months, here in Bangalore. It costed me Rs. 4000 at a private clinic.