Gas prices aren't THAT high... Gas Prices: UNLEADED, UNLEADED PLUS, PREMIUM UNLEADED, DIESEL #2. Minimum Octane Rating (R+M)/2 Method 87 PRESS, Minimum Octane Rating (R+M)/2 Method 89 PRESS, Minimum Octane Rating (2+2=3) Method 91 PRESS, DIESEL PRESS. (Featuring images of Willie Nelson, Snoop Dogg, Hunter Biden, and Charlie Sheen)