The difference between i and my friends and my friends and i is purely a matter of courtesy - they are both grammatically correct.
I would tend to stick to the latter though, as it a) is more commonplace, b).
I'm jonesing for a little ganja, mon i'm jonesing for a little soul food, brother (verb) jonesed;
Joneses to have a strong desire or craving for something (merriam webster) where
Mrs. and jones are separate words so a space must be placed between them.
It may be worth noting that in commonwealth english, no full-stop is included for abbreviations that consist of the first.
Jones was appointed chairman.
The null article example has a similar quality to your mayor example.
Note that both zero article and null article refer to something that is absent from the.