In a recent study on oxygen-containing heterocycles, two of the current authors suggested the gas phase enthalpy of formation of 2,5-dihydrofuran in lieu of an experimentally determined quantity. The current study provides new analysis with well-precedented assumptions and literature measurements to result in the value (-63 +/- 4) kJ . mol (1). For the isomeric 2,3-dihydrofuran the value of (-77 +/- 3) kJ . mol (1) is suggested in satisfactory accord with the combustion calorimetric combustion result of (-72.2 +/- 0.4) kJ . mol (1). (C) 2016 Elsevier Ltd. All rights reserved.