Does this Costco have gas station?

Yes, there is a gas station.

Japanese beef

yes

Yes there is.

Yes. It's towards the back, on the same side as the main entrance to the parking lot.

Yes. Best time to go is right before they close. The wait time is usually 5 minutes then. I usually go around 8pm on a weekday or a little later.

There is a gas station and there is a long line at any time of the day, as well

Yes, but expect to have a wait

Yes, the Costco in South San Frsncisco does have a gas station on location.

Yes this has a gas station in the back