If you're coming from the 15, yeah, it wouldn't make sense for you to go this way.
I'm coming from the 5, so it makes more sense. The gas station is on the corner of the 5N onramp and Ortega Highway.
The station has a decent amount of parking and when you make a left out of the station, Ortega is right there.
Although if enough people want to meet up on the other side, I can just take the 15 up instead of the 5.