The gas stations where I travel advertise it on their little signs out front. I suppose you could ask a manager. Heck, we're buying their product - might as well ask what you are getting?
In the "city" you have to buy the smog gas. Out in the country where I live, it's all "real gas". This doesn't have the winter/summer blends to it. I have noticed a big difference in FE by buying "real gas" compared to "city" gas. Thus my change in fueling stations.
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