A ribbed high efficiency belt , comprising: a backing layer ; a rib material layer disposed on the backing layer; a plurality of cords embedded within the rib material; and a plurality of ribs formed on a face of the belt opposite the backing layer ; wherein the coefficient of friction of the high efficiency belt is greater than or equal to 0.04 mm/N times the bending stiffness of the high efficiency belt ; wherein the material of the rib material layer comprises: about 30 wt.% to about 70 wt.% rubber stock; about 5 wt.% to about 30 wt.% reinforcement material; and about 5 wt.% to about 45 wt.% filler; wherein the reinforcement material comprises elongated segments and the elongated segments are aligned in parallel with one another within the rib material ; wherein the parallel aligned reinforcement material is aligned transverse to the direction of rotation of the high efficiency belt ; wherein the high efficiency belt has an anisotropic modulus of elasticity; and wherein the ratio of the modulus of elasticity in the direction in which the reinforcement material is aligned to the modulus of elasticity in the direction transverse to the direction in which the reinforcement material is aligned is in the range of from 1.1 and 50 a backing layer ; a rib material layer disposed on the backing layer; a plurality of cords embedded within the rib material; and a plurality of ribs formed on a face of the belt opposite the backing layer ; wherein the coefficient of friction of the high efficiency belt is greater than or equal to 0.04 mm/N times the bending stiffness of the high efficiency belt ; wherein the material of the rib material layer comprises: about 30 wt.% to about 70 wt.% rubber stock; about 5 wt.% to about 30 wt.% reinforcement material; and about 5 wt.% to about 45 wt.% filler; wherein the reinforcement material comprises elongated segments and the elongated segments are aligned in parallel with one another within the rib material ; wherein the parallel aligned reinforcement material is aligned transverse to the direction of rotation of the high efficiency belt ; wherein the high efficiency belt has an anisotropic modulus of elasticity; and wherein the ratio of the modulus of elasticity in the direction in which the reinforcement material is aligned to the modulus of elasticity in the direction transverse to the direction in which the reinforcement material is aligned is in the range of from 1.1 and 50 about 30 wt.% to about 70 wt.% rubber stock; about 5 wt.% to about 30 wt.% reinforcement material; and about 5 wt.% to about 45 wt.% filler; wherein the reinforcement material comprises elongated segments and the elongated segments are aligned in parallel with one another within the rib material ; wherein the parallel aligned reinforcement material is aligned transverse to the direction of rotation of the high efficiency belt ; wherein the high efficiency belt has an anisotropic modulus of elasticity; and wherein the ratio of the modulus of elasticity in the direction in which the reinforcement material is aligned to the modulus of elasticity in the direction transverse to the direction in which the reinforcement material is aligned is in the range of from 1.1 and 50 <EOS>