We consider G 2-manifolds with an effective torus action that is multi-Hamiltonian for one or more of the defining forms. The case of T 3-actions is found to be distinguished. For such actions multi-Hamiltonian with respect to both the three-and four-form, we derive a Gibbons-Hawking type ansatz giving the geometry on an open dense set in terms a symmetric 3 × 3-matrix of functions. This leads to particularly simple examples of explicit metrics with holonomy equal to G 2. We prove that the multi-moment maps exhibit the full orbit space topologically as a smooth four-manifold containing a trivalent graph as the image of the set of special orbits and describe these graphs in some complete examples. Contents 14 4.2. Comparing with the flat models 17 4.3. Deforming to the flat model 19 4.4. Identifications of the quotients 21 5. Explicit examples of toric G 2-manifolds 24 5.1. Some complete examples 24 5.2. Ansätze simplifying the PDEs 28 References 31