Anyone experienced more MPG by running Exxon Synergy gas?

Top Tier has nothing to do with MPG and everything to do with the quantity (not quality) of detergents.

There is nothing preventing anyone from using Top Tier quantities (or greater) without paying Top Tier tithe. The whole point of TT is for the little guys to claim their gasoline is as good as Shell, Texaco/Chevron, Exxon, etc.
I never said it did......
 
Where do costco store the additive containers? Is it in a UST and added by pump? Seems not safe to be bopping out with a carboy and a hand crank transfer pump and poor maths capabilities - otherwize.
I don't know but that's what Costco helpline tech told me when I asked them regarding their Top Tier label. He/She/It also told me that the same concentration of detergent is added to both the regular and the supreme.

As per maths capabilities and knowing Costco they most likely tried their best to be dummy proof. I e. Add 1 container per new truck delivery or something along those lines.
 
Where do costco store the additive containers? Is it in a UST and added by pump? Seems not safe to be bopping out with a carboy and a hand crank transfer pump and poor maths capabilities - otherwize.
Personally as long as the gas has it-I'm not concerned with their day to day operations. Costco is a top notch outfit-there are examples all over the place that proves this.
BTW-in my younger poorer days-I ran plenty of "cheap gas". The car didn't blow up.

To suggest otherwise is just conversation fodder.
 
Personally as long as the gas has it-I'm not concerned with their day to day operations. Costco is a top notch outfit-there are examples all over the place that proves this.
BTW-in my younger poorer days-I ran plenty of "cheap gas". The car didn't blow up.

To suggest otherwise is just conversation fodder.
My car being a 4 cylinder blows up at a rate of 1400 explosions per minute at idle; thankfully so far most of the detonations are contained within the combustion chamber.

Speaking of poorer days: you just gave me a great business idea! I should invest in a taco truck and park it in the gas station parking lot. Then go on GasBuddy and report the gas prices to be 1.05 regular and 1.99 Premium.
 
My car being a 4 cylinder blows up at a rate of 1400 explosions per minute at idle; thankfully so far most of the detonations are contained within the combustion chamber.

Speaking of poorer days: you just gave me a great business idea! I should invest in a taco truck and park it in the gas station parking lot. Then go on GasBuddy and report the gas prices to be 1.05 regular and 1.99 Premium.
And hopefully they aren’t detonations.
 
All gasoline at the distribution center is the same. The additive packages are added per lic per truck right during the fillup.

Costco does it differently. They get a pure non additive gas from the distribution center. Then the additives are added by the Costco attendant right at the pump when the fuel is delivered. In the end shell, Mobil and Exxon gets the same gas as Costco does. The difference is in additives and when they are added.
I have never seen that at Costco. I have seen Murphy Oil try to sell additional additives at extra cost at the pump. The truck delivering to Costco simply puts the hose in the hole and opens the spigot.

If as you say, the attendant dumps a packet of additives in the partially full underground tank, resulting in a rich mixture being delivered to those currently buying fuel until the tanker has emptied his load. Or, the tanker empties his load leaning the mixture underground until he is finished then the attendant dumps a packet.

Furthermore if the underground tank does not take the full truck load, how does the attendant handle proportioning the additives?

For what reason would Costco want to apply the additives at the destination? Why would Costco risk exposing an employee to highly concentrated toxic chemicals?

Other posts theorized Costco simply purchases the cheapest fuel on the spot market, be it Shell, Texaco, or whatever. But how do those become available? Shell additives are not available to any who wish. I say what happens is the delivery driver (who usually owns the fuel in his tanker during transit) made a Shell delivery and the station tank could not hold all the fuel he was carrying. He then calls friendly independents nearby and says, "I have N gallons of Shell 87 for $X/gallon, do you want it?"

No doubt Top Tier will negotiate anything, especially for a customer like Costco. But in my investigations Top Tier "monitors" quality by auditing your fuel depot purchase records. They want to see their minimum quantities of whatever detergent you used (TT probably has a minimum spec for every EPA approved additive package) were added to gasoline which meets their other (trivial) specs such as 8% fuel grade ethanol.

Always found it interesting how Shell, Texaco, et al, trust generic fuel depots with their precious additive packets.
 
I have never seen that at Costco. I have seen Murphy Oil try to sell additional additives at extra cost at the pump. The truck delivering to Costco simply puts the hose in the hole and opens the spigot.

If as you say, the attendant dumps a packet of additives in the partially full underground tank, resulting in a rich mixture being delivered to those currently buying fuel until the tanker has emptied his load. Or, the tanker empties his load leaning the mixture underground until he is finished then the attendant dumps a packet.

Furthermore if the underground tank does not take the full truck load, how does the attendant handle proportioning the additives?

For what reason would Costco want to apply the additives at the destination? Why would Costco risk exposing an employee to highly concentrated toxic chemicals?

Other posts theorized Costco simply purchases the cheapest fuel on the spot market, be it Shell, Texaco, or whatever. But how do those become available? Shell additives are not available to any who wish. I say what happens is the delivery driver (who usually owns the fuel in his tanker during transit) made a Shell delivery and the station tank could not hold all the fuel he was carrying. He then calls friendly independents nearby and says, "I have N gallons of Shell 87 for $X/gallon, do you want it?"

No doubt Top Tier will negotiate anything, especially for a customer like Costco. But in my investigations Top Tier "monitors" quality by auditing your fuel depot purchase records. They want to see their minimum quantities of whatever detergent you used (TT probably has a minimum spec for every EPA approved additive package) were added to gasoline which meets their other (trivial) specs such as 8% fuel grade ethanol.

Always found it interesting how Shell, Texaco, et al, trust generic fuel depots with their precious additive packets.
I have posted info detailing the Costco additive system here you should be able to find searching. I have a friend that installs these systems for Costco.
 
I have never seen that at Costco. I have seen Murphy Oil try to sell additional additives at extra cost at the pump. The truck delivering to Costco simply puts the hose in the hole and opens the spigot.

If as you say, the attendant dumps a packet of additives in the partially full underground tank, resulting in a rich mixture being delivered to those currently buying fuel until the tanker has emptied his load. Or, the tanker empties his load leaning the mixture underground until he is finished then the attendant dumps a packet.

Furthermore if the underground tank does not take the full truck load, how does the attendant handle proportioning the additives?

For what reason would Costco want to apply the additives at the destination? Why would Costco risk exposing an employee to highly concentrated toxic chemicals?

Other posts theorized Costco simply purchases the cheapest fuel on the spot market, be it Shell, Texaco, or whatever. But how do those become available? Shell additives are not available to any who wish. I say what happens is the delivery driver (who usually owns the fuel in his tanker during transit) made a Shell delivery and the station tank could not hold all the fuel he was carrying. He then calls friendly independents nearby and says, "I have N gallons of Shell 87 for $X/gallon, do you want it?"

No doubt Top Tier will negotiate anything, especially for a customer like Costco. But in my investigations Top Tier "monitors" quality by auditing your fuel depot purchase records. They want to see their minimum quantities of whatever detergent you used (TT probably has a minimum spec for every EPA approved additive package) were added to gasoline which meets their other (trivial) specs such as 8% fuel grade ethanol.

Always found it interesting how Shell, Texaco, et al, trust generic fuel depots with their precious additive packets.
All of those very valid questions can be answered by Costco support via email.
 
We run Exxon all the time as there is a station a 1/4 mile from the house. I have not seen any difference between it and Sunoco or Rutters that we run as well but they are both Top Tier as well. Only difference I have seen is when we have used TurkeyHill gas as the vehicles don't run as smoothly, little grumbly at idle on regular.
Now we did recently get a Walmart membership as you get 20¢ off per gallon when paying threw the Walmart app at Exxon stations. Bonus for me as it is less likely to get cc info stolen at home and while traveling and the Exxon is usually the cheapest in town.
 
I was using BJs 93 gas almost exclusively, it was a minimum $.10 cheaper than add in there special deals. I’ve been running Sunoco 89 and the vehicle has better pick up. And I feel I can extend IVD cleaning.
 
See post directly above.
no results.webp
 
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