TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The renewable fuel blend comprises from 3 vol.% to 15 vol.% biologically derived 13-18C normal paraffins; the renewable fuel blend comprises at least 5 vol.% 13-17C biologically derived normal paraffins; the renewable fuel blend comprises no more than 3 vol.% biologically derived 18C normal paraffins; or the renewable fuel blend comprises no more than 3 vol.% biologically derived 12C normal paraffins. The ratio Delta C18/( Delta C14 + Delta C16) is in the range of between 0.01 and 0.4. The renewable fuel blend comprises from 80 to 99 vol.% petroleum derived hydrocarbons and from 1 to 20 vol.% biologically derived hydrocarbons, and having a boiling point range of between 200 degrees C and 350 degrees C. Preferred Parameters: The renewable fuel blend has a pour point in the range of from 0 degrees C to -65 degrees C. The renewable fuel blend has a cloud point in the range of from 0 degrees C to -65 degrees C. It comprises biologically derived 13-18C normal paraffins such that the following relationship holds: 47.41 asterisk Delta C18 - 20.04asterisk Delta C16 -18.91 asterisk Delta C14 less than or equal to 0 where Delta C18 represents a quantity of biologically derived C18 normal paraffins, as a vol.% of the renewable fuel blend; Delta C16 represents a quantity of biologically derived C16 normal paraffins, as a vol.% of the renewable fuel blend; and Delta C14 represents a quantity of biologically derived 14C normal paraffins, as a vol.% of the renewable fuel blend. Preferred Process: Producing renewable fuel blend further comprises recovering a renewable fuel blend that comprises from 3 vol.% to 15 vol.% biologically derived 13-18C normal paraffins; recovering a renewable fuel blend that comprises at least 5 vol.% biologically derived 13-17C normal paraffins; recovering a renewable fuel blend that comprises biologically derived 13-18C normal paraffins, such that the ratio Delta C18/( Delta C14 + Delta C16) is in the range of between 0.01 and 0.4; and recovering a renewable fuel blend that comprises biologically derived 13-18C normal paraffins, such that the following relationship holds: 47.41 asterisk Delta C18 - 20.04asterisk Delta C16 -18.91 asterisk Delta C14 less than or equal to 0 where Delta C18 represents a quantity of biologically derived C18 normal paraffins, as a vol.% of the renewable fuel blend; Delta C16 represents a quantity of biologically derived C16 normal paraffins, as a vol.% of the renewable fuel blend; and Delta C14 represents a quantity of biologically derived C14 normal paraffins, as a vol.% of the renewable fuel blend. EXAMPLE - No suitable example given.