Find a bag and read what the coverage is. I would not be surprised if every bag was a little different depending on coatings and seeds inside.

It doesn't say how much, just a break down of cultivators.

8lbs/K should be sufficient.

I bought extra seed. I been told as long as the seed is kept cool and dry it could last a year or two. What do you think about storing in a container with silicon bead packets in the basement.

Seed is expensive so since its TTTF I may need to overseed next year

There are approximately 1,400,000 KBG seeds in one pound and 225,000 TTTF seeds in one pound.

Recommended rates for seeding are 3-5 lbs/k for KBG and 8-10lbs/k for TTTF.

EDIT: To clarify, A 10# bag of a TTTF and KBG seed mix that is labeled 10% KBG, would contain 1,400,000 KBG seeds and 2,025,000 (225,000 X 9) TTTF seeds.