Arco gas - mileage poor
 

I've always believed that gas is gas. However, I can help but notice that everytime I have used Arco gas, my mileage has been less. It's not once or twice. The last 5 times I've used it, it's been quite noticeable. Also, the point where my fuel needle hits when I have gone 200 miles is significantly lower when running on Arco gas.

Am I crazy? I've been trying to be as objective as possible and there is a trend for me.

Ive noticed the same thing here in jersey with wawa gas. Ive been sticking to bp gas and get the best mileage from it.

Depends on the car. My Bronco used to LOVE Sam's club gas, but my next vehicle detested it. My Focus hates Sam's gas too. My Mustang and bike are totally indifferent, however.

I used to use Arco exclusively (cheapest AND closest gas station), never noted that my car got particularly bad mileage...but I didn't keep track back then.