boutique blend
n.β Β«Prices started to creep up when Clarke County was included on the list of Georgia counties where gas stations must sell a cleaner-burning gasoline mixture, commonly known as a boutique blend.Β» ββPumping it for all itβs worth” by Merritt Melancon Athens Banner-Herald (Ga.) Sept. 4, 2005. (source: Double-Tongued Dictionary)