Cite this as: 

A. Karton, J. M. L. Martin. Explicitly correlated benchmark calculations on C8H8 isomer energy separations: How accurate are DFT, double-hybrid and composite ab initio procedures? Molecular Physics, 110, 2477–2491 (2012). 

http://dx.doi.org/10.1080/00268976.2012.698316

Reference energies 

CCSD(T)/CBS isomerization energies (∆Eiso) from W1-F12 theory (kcal/mol).
Filename ∆Eiso 
1        0.00
2        11.52
3        18.42
4        19.68
5        20.39
6        20.97
7        24.85
8        25.36
9        28.00
10       28.79
11       36.08
12       36.90
13       37.09
14       42.65
15       43.71
16       45.78
17       47.62
18       48.37
19       48.43
20       60.26
21       60.92
22       62.19
23       63.39
24       63.46
26       67.83
27       68.59
28       70.99
29       71.18
30       72.50
31       77.69
32       78.92
33       80.61
34       81.82
35       88.22
36       88.29
37       88.58
38       91.88
39       92.11
40       96.95
41       109.92
42       115.49
43       115.73
44       116.00
45       124.46