U can add gas there only if you have costco card for gas supply And it is always crowded
Been to tons of Costco gas stations across the western coast, This one isn't too bad at $2.80 a gallon on 1-14-18 considering the massive tax increase in CA; filled up 2 days ago in Arizona at $2.32 at a flying J. Pretty much always try to come to this Costco when in town, but usually try to fill up at Costco gasoline stations when I travel.
Follow Google's daily analytics as to when to come if you can, to avoid it terrible wait times as this location only has 2 pumps per lane and some people just take forever it seems.
Thursday's seem to be the least busiest, I came on a Sunday at rush hour haha, wait time was around 8 minutes and that was me choosing the line with only 3 people in front at the time. Some had 6 or 7 for some reason...
Please don't choose this time to clean your car or argue with your spouse haha, get fuel and go, do your mileage log in the parking lot.