The present experimental study reports the effect of CO2/N-2 dilution on laminar burning velocity of premixed LPG (liquid-petroleum-gas)-air mixtures at elevated temperatures using a preheated mesoscale diverging channel technique. The experiments were carried out for a range of equivalence ratios varying from 0.8 < Phi < 13 with percentage dilution of the fuel component by volume (beta) for CO2 varying from 10% < beta < 30% and N-2 varying from 10% < beta < 40%. A power-law correlation has been obtained for the present experimental data as a function of percentage dilution, mixture temperature and equivalence ratio. It has been observed that an increase in dilution with CO2/N-2 leads to an increase in temperature exponent (alpha). The increase in temperature exponent due to CO2 dilution is more pronounced as compared to N-2 dilution case. A flame structure study has been carried out to understand the effect of mixture temperature and diluent using USC (University of Southern California) Mech II reaction mechanism. (c) 2016 Elsevier Ltd. All rights reserved.