Numerical and experimental studies on the determination of burning velocities of landfill gas (LEG) fuel and LFG-mixed fuel with LPG have been conducted. The propriety of numerical results is inspected for the adopted GRI-v2.11 and two C3 reaction mechanisms separately developed by Sung et al. and Qin et al. The predicted burning velocities using the C3 reaction mechanism suggested by Sung et al. are in good agreement with the present and previous experimental data. Based on numerical results, the correlation forumla of maximum burning velocities of LEG fuel and LFG-mixed fuel with LPG is proposed as a function of the blending percentage of CH4 and LEG at Phi = 1.0. In addition, the correlations of burning velocities of LFG fuel and LFG-mixed fuel with LPG are obtained over a wide range of equivalence ratio. The proposed correlation formulas of burning, velocities for LFG fuel and LFG-mixed fuel with LPG are quite well in accord with numerical results. (C) 2002 Elsevier Science Ltd. All rights reserved.