SH Preflop rule of thumb

[Hattifnatt]

I am playing mostly 2/4 NL 6-handed and have a rule of thumb preflop.

That is:
Never play a hand that does not contain:
A pair
Two cards Ten and above
Suited connector or one gap
Axs

That way I avoid troublehands as Q8s and A9o etc.

Do you think I lose much EV with that strategi? For example folding A9o in SB against BB.

Of course I don't play the hands above every time, the rule is just to always fold the other hands (expect in BB in unraised pot).

Other thoughts?