NOVELTY - A blended oil composition, comprises a high oxygen content bio-oil with an oxygen content of at least 10 wt.% blended with a low oxygen content bio-oil with an oxygen content of less than 8 wt.%.    USE - For rendering biomass-derived pyrolysis oil miscible with refinery hydrocarbons (claimed), particularly for preparing biofuels, including lignocellulose-derived bio-oils compatible with refinery process streams.    ADVANTAGE - The present method produces bio-oil product having reduced oxygen content, lower molecular weight, and is suitably miscible for use in a refinery stream for further hydroprocessing, or it can be used as recycle oil for processing additional coarse bio-oil.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) rendering (m1) biomass-derived pyrolysis oil miscible with refinery hydrocarbons, involving: mixing a high oxygen content bio-oil comprising an oxygen content of at least 10 wt.% with a low oxygen content bio-oil having an oxygen content of less than 8 wt.% to yield a blended oil; and    (2) a system for producing a bio-oil comprising: a biomass conversion unit facilitating production of a high oxygen content bio-oil from a biomass feedstock; a first mixing unit comprising a first inlet receiving the high oxygen content bio-oil from the conversion unit and a second inlet receiving a low oxygen content bio-oil from a bio-oil feedstock to form a blended oil; a hydrotreater comprising an inlet receiving the blended oil from the first mixing unit to produce a hydrotreated bio-oil mixture; and a separator for separating water from the hydrotreated bio-oil mixture to produce a low oxygen content hybrid bio-oil intermediate, and comprising a first inlet receiving the hydrotreated bio-oil mixture from the hydrotreater, an outlet supplying the low oxygen content hybrid bio-oil intermediate to the first mixing unit, and optionally an outlet supplying the low oxygen content hybrid bio-oil intermediate to a source of refinery hydrocarbons.