Exhibit 23.6

CONSENT OF INDEPENDENT PETROLEUM ENGINEERS

We do hereby consent to the use of our name and the information regarding our review of Argosy Energy International’s estimates of reserves and future net cash flows from the production and sale of those reserves in the Registration Statements (Form S-1) of Gran Tierra Energy Inc.

HUDDLESTON & CO., INC.

/s/ Peter D. Huddleston, P.E.

Peter D. Huddleston, P.E.
President

Houston, Texas
April 9, 2007