Look at the bottom right corner of page 4-10 of the owner's manual. It says 86 octane ((r+m)/2 method) or 91 research octane. Use the lowest octane that doesn't produce knocking.
2013 V Star 1300 Deluxe
OEM Tall Sissy Bar
Memphis Shades Fork Deflectors
Bridgestone Exedra Max Belted Tires
Baron's RSTD 7308 bar