But if you're going to play anyway, you might as well pick from the pool of numbers that have a higher probability of occurring.  I have calculated the actual percentages of all drawings since October 9, 2002 when they added 4 numbers.

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Combination   Expected   Actual    Difference
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0odd/5even      2.29%     1.91%     -0.90%  
1odd/4even     14.07%    15.79%     -0.11%
2odd/3even     31.80%    31.58%     -1.55%
3odd/2even     33.13%    31.10%     -0.70%
4odd/1even     15.90%    16.75%     +2.68%
5odd/0even      2.81%     2.87%     +0.58%