Anyone experiencing terrible gas mileage?

I think you're right about the swapping of gas. I change gas from one place to another and my mileage is all different.

 

jup, I use to use COSTCO cause it was the cheapest and most consistant with the mpgs, then I got a credit card from one of these gas/junk food/coffee places giving me me 25 cents off per a gallon of gas for 2 months and noticed my mpgs dropped automatically with it.

 

I think im gonna stick with Costco to the lines in SD are pretty bad and I get lazy lol.

 

got to hit them on the right day its hard to do if you work a regular 9 to 5 cause everyone is there on weekends and after 4pm

 

This makes alot of sense now, i noticed that when i pump gas at a shell that offers me 15 cents off per gallon, I usually get @16-17 mpg. Ive pumped at a chevron and ive gotten 18-19 mpg. Might be the crap fuel mixture these gas stations are selling, offering incentives so you keep coming back...