<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by ph-ndr:
I'm in the process of ditching *A and stating up with OW, and have decided to kick off a serious mileage run and have this route confirmed:
osl-lhr-dxb-lhr-dub-lax-mia-sxm-sju-dfw-pdx-
dfw-lax-hkg-cgk-hkg-per-syd-bne-syd-nrt-lhr-
osl
All in C/D/F(us) class and done in a month travel 
Does anyone know how this will pan out with BA ExecClub and tier points?</font>
It does depend a bit on which BA scheme you join as far as the miles go, but the tier points will be the same. For mileage accrual I would recommend joining the UK scheme initially for this trip since the mileage accrual will be the best ( 2x for business and 3x for 1st ), whereas to attain Gold status you will need to join the mainland EU scheme
You can download the handbooks at
https://www.britishairways.com/execclub/handbook/ and study
Tier credits will be around
Any scheme other than Continental Europe
60 , 100, 100, 30, 160, 150, 30, 30, 100 getting to DFW which will get you silver status ( OW sapphire )
45, 45, 45, 120, 100, 100, 100, 100, 30, 30, 100, 160, 60 giving a total of 1045. This will be enough to renew your Silver status for the following year but not enough to attain gold.
If you join the Continental Europe scheme
60 , 100, 100, 30, 160 will give you Silver
150, 30, 30, 100,45, 45, 45, 120, 100, 100, 100 will give you Gold status
Dave