Review for Okmulgee Travel Plaza Review For Okmulgee Travel Plaza Google User Oct 11 '17 at 20:36 Only place that I know of in the area with 93 octane (E10). Premium everywhere else around here is 91. Regular E10 is 89 instead of 87, and Midgrade (E10) 91 instead of 89. Higher octane without the higher price. They also have 87 with no alcohol. Diesel at the back pumps. View full site to comment or like