wB97XD/Def2-SVP/SCRF=dichloromethane  

HCCH                         HCC• + H•                        CC + H•

-77.2421636374  =   (-76.5107901661  +  -0.501896617511)  = (-75.7764210915  +  -0.501896617511)

-77.2421636374  = -77.012686783611,  -76.5107901661  =  -76.27831770901
      
ΔE  144.0                   ΔE     145.9  
      
ΔΔE = +1.9 kcal/mol