NOVELTY - Efficient biomass conversion method comprises: identifying a sawmill location where substantial quantities of biomass are generated; installing a fast pyrolysis unit (30) at sawmill location; feeding biomass generated at sawmill in fast pyrolysis unit under pyrolytic reaction conditions; introducing biomass in pyrolysis unit; removing exhaust gases having entrained matter resulting from the reactions within the fast pyrolysis unit; separating and collecting bio-fuel entrained in exhaust gases; and using at least a portion of collected bio-fuel to power the sawmill.    USE - The method is useful for efficient biomass conversion (claimed), which to produce bio-oil products, where the products are useful to power the chip and saw facility.    DETAILED DESCRIPTION - Efficient biomass conversion method comprises: identifying a sawmill location where substantial quantities of biomass are generated; installing a fast pyrolysis unit at the sawmill location and providing the fast pyrolysis unit with a burn enclosure (44), a combustion chamber (31), an inner pyrolysis chamber (35) and an outer pyrolysis chamber (39) arranged generally concentrically such that the combustion chamber is innermost substantially surrounded by the inner and outer pyrolysis chambers, and with a first proximal end of the combustion chamber extending from and in communication with an end of a rearward portion of the burn enclosure, and a second distal end of the combustion chamber in communication with a first proximal end of the inner pyrolysis chamber, and a second distal end of the inner pyrolysis chamber in communication with a first proximal end of the outer pyrolysis chamber; feeding biomass generated at the sawmill into the fast pyrolysis unit under pyrolytic reaction conditions including injecting an mixture of air and fuel under pressure into the burn enclosure and igniting the mixture to facilitate combustion of the mixture in a first direction through the combustion chamber while simultaneously deoxygenating the combustion chamber; introducing biomass into the pyrolysis unit at a location proximal to both the second end of the combustion chamber and the first end of the inner pyrolysis chamber, in the presence of sufficient temperature and in the substantial absence of oxygen to cause pyrolysis of the biomass to occur along the length of the inner pyrolysis chamber between the first and second ends; removing exhaust gases containing entrained matter resulting from pyrolytic reactions within the fast pyrolysis unit; separating and collecting bio-fuel entrained in the exhaust gases; and using at least a portion of the collected bio-fuel to power the sawmill. An INDEPENDENT CLAIM is also included for an efficient biomass conversion system comprising: the fast pyrolysis unit installed at the sawmill location, where the fast pyrolysis unit comprises the burn enclosure, the combustion chamber, the inner pyrolysis chamber and the outer pyrolysis chamber; means for introducing biomass into the pyrolysis unit at the location proximal to both the second end of the combustion chamber and the first end of the inner pyrolysis chamber; means for injecting the mixture of air and fuel under pressure into the burn enclosure; means for igniting the mixture in the burn enclosure to facilitate combustion of the mixture in a first direction through the combustion chamber while simultaneously deoxygenating the combustion chamber; means for removing the exhaust gases containing entrained matter resulting from pyrolytic reactions within the fast pyrolysis unit; means for separating and collecting the bio-fuel entrained in the exhaust gases, where means are fitted between the separation and collection means and the sawmill to permit use of at least a portion of the collected bio-fuel to power the sawmill.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a pyrolysis system.    Pyrolysis unit (30)    Combustion chamber (31)    Inner pyrolysis chamber (35)    Outer pyrolysis chamber (39)    Burn enclosure (44)