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Discussion Starter #1 (Edited)
I have a Sam's Club and Costco within 5 miles of my house. They both are about $3.34 per gallon for diesel, vs. $3.79 almost everywhere else. Anyone buy their fuel at Costco or Sam's? Anything wrong with their fuel? At almost 50 cents per gallon savings on a 21 gallon tank is pretty nice.....but not if I am effing up the engine.
 

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I have found that if you buy product from a station that really moves product that you'll be fine. My favorites are Shell, Sunoco, Speedway and Exxon. I've learned to not buy from the lower tier merchants due to mileage issues. Upper tier fuel is only cents per gallon, so I try to use what the truck performs best with. I think the most important issue is how fast the merchant moves fuel! Nobody likes stale bread.
 

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Discussion Starter #5
Ok, the wife has a 328d, and on the BMW forum, there was talk about cheap fuel causing the injectors to get clogged, and BMW not covering the repair due to "low quality gas."
 

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I try to buy it at the cheapest place. There are a couple of places near home I hit and near work nearly 500 miles away. I never could make it work on 1 tank of gas back when I had my Tacoma.
 

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Ok, the wife has a 328d, and on the BMW forum, there was talk about cheap fuel causing the injectors to get clogged, and BMW not covering the repair due to "low quality gas."
Did BMW specified the exact diesel to be used? Is there identifier for such diesel? Don’t sound right to me because My wife had a X35d and and had fuel injection issues and bmw fixes it every time. There was never any mentioning of cheap diesel. We got rid of it because the wife spent more time driving a loaner than her X5.
 

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I check the cetane. Seems most are slightly low. I found anyone with 10-15% bio diesel lets me get my 29-30 MPG on my diesel Canyon. Then if I use chevron, Exxon, Texaco or walmart/sam i drop to 27-28 same driving pattern. I also get 28-29 on QT. So if I am in a bind QT is the go-to. I also find HEB seems to cover the 28-30 range in various parts of texas. I figure they buy from spot distributors and that is why the variation.
 

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Low cost, low tier gas stations partly achieve their cost savings by contracting fuel lots which, while technically meeting the spec, have lower quality fuels blended in because they're willing to buy fuel coming from the slug in the pipeline where one batch ends and another batch begins. Higher tier stations pay more to avoid those supply variances.

But practically speaking, I've fueled up locally, I think at Shell, and there's a sticker on the pump saying that the diesel isn't sourced from a Shell supply chain, or something to that affect. Basically, the sticker's implying that they contract out diesel supply from someone else, so perhaps we really don't know how tightly its quality is ensured.

Also, while I'm as proud of fuel economy as the next guy, i'd hesitate to attribute short term variances to where I bought the fuel. A statistically significant study, eliminating variances in temperature, humidity, air pressure, winds, DEF cycles, and of course route and traffic conditions, would be quite difficult to achieve and I doubt I could accurately say (from the viewpoint of being a licensed mechanical engineer) that one fuel gave me more mileage than another. Although I admit my driving conditions (city, front range, varying altitudes and wildly varying weather) may be more variable than others...
 

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Where we live, we have a Shell station close by that gets a lot of gas/fuel business. I fill-up there when needed. When we travel x-country, we use the name brand (Flying-J, Love's) travel centers. Haven't had any fuel related issues yet Mac:).
 

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I have been using Costco exclusively since I purchased the 2018 Canyon 2.8 diesel.
I have almost 20k miles on the truck.
Also use the Costco Visa, gets another 4% back.
I also had the stock tank replaced with the 36 gallon Titan tank.
And get almost 1000 miles per tank.
 

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I have a Sam's Club and Costco within 5 miles of my house. They both are about $3.34 per gallon for diesel, vs. $3.79 almost everywhere else. Anyone buy their fuel at Costco or Sam's? Anything wrong with their fuel? At almost 50 cents per gallon savings on a 21 gallon tank is pretty nice.....but not if I am effing up the engine.
I buy regularly at Costco and have not had any issues with their fuel, I get 22mpg around town and 31mpg on highway driving.
 

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Discussion Starter #14
OK, thanks guys. I like saving money but would not do it if it jeopardized the engine.
 

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I often wondered this myself and here is what I learned a long time ago. Fuel comes through shared pipelines to terminals. The fuel is then distributed to stations. In essence, you buy your fuel from shell, but CITGO may own the terminal so that is what you’re running. The only difference is the additives added to the fuel post delivery. So, fuel at mapco and the shell next door came off the same truck. I assume this is true for diesel because I see the same distributer at my station for both.
 

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