I found this reward that costs only 75k that gets me leg from SFO to SEA to NRT where i'm in BIZ Class and all the rest in economy. I am 6k short. Should i go on mileage run and get the miles and hopefully that flight will still be there?
I saw something similar where one leg out of US to NRT was also in biz but that was for 85k miles.
Any input?
I"m a regular member, nothing special, found plenty of 60k economy flights. 75/60 no biggie, prob is i'm at 69k right now.

I do have visa card that gets me 1mi per $2 spent but i can't rack up 12k in charges that fast and my CL is only 6k.