Equatorial 3-methyl methylenecyclohexane (2) is favored over the axial isomer 1 by 1.4 kcal/mol (experimentally measured value). The 1,3-diaxial interaction energy between H and a lone pair is negligible (~ 0 kcal/mol). What is the 1,3-diaxial interaction (in kcal/mol) between a CH3 and a p orbital?