Charting fill-ups by fuel station?

[WXman]

I've been charting fill-ups for a long time with Fuelly. I love it. In April 2018 I leased a new Jeep Wrangler JL. It got fantastic fuel economy for such a rugged SUV. I've now owned it for 8 months and I'm starting to get a pretty nice trend line in my Fuelly data.

My question is.. can I chart my fill-ups by fuel retailer? I always enter the brand of fuel I'm buying when I fill up, so that data point is on my Fuelly records. But I can't figure out how to chart my data based upon fuel retailer.

Reason I want to do this is because I'm starting to notice that a particular fuel retailer here in my area (Marathon) seems to consistently result in a significant decrease in MPGs for me. The only way to know for sure would be to chart the data and actually look at real numbers.