boutique blend
n.— «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.» —“Pumping it for all it’s worth” by Merritt Melancon Athens Banner-Herald (Ga.) Sept. 4, 2005. (source: Double-Tongued Dictionary)
Further reading
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