nope, same driver, same speed, same day, same route, same car, same number of people, same load. i know chemical engineers that work at refineries. Costco gets the reject stuff that shell and other brands sell. sometimes even with octane booster they cant get it to the correct octane, and that gets sent to wholesale.
Anyone experienced more MPG by running Exxon Synergy gas?
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oh ok.
I'm not talking about distribution, I'm talking about when it comes out of the cracker.
its possible there is a difference between costco regular and premium beyond the obvious. all i know is the car was regularly filled with shell regular and i ran costco one time and there was a noticeable difference in mpg.
oh ok.
It would take some seriously controlled and extensive testing to determine one brand of gasoline is provides better MPG than another. Way too many variables between driving conditions to weather to variances in batches.
I’d buy which ever top tier is cheapest for you.
There has been a controlled study or two, I cannot source them at the moment, that indicated the best TT gaso's like Shell, E-M does deliver a measurably better MPG's than typical no name cheap gas. It was not a huge difference but a small but clear difference that over time would matter. Enough to offset the usual higher cost of TT? No, but TT is a better, cleaner product. The slightly better MPG is a bonus.
The real factor affecting mpg's is regional formulations and summer & winter blends. Much of that is unavoidable, but by FAR the easiest way to better mpg's for the individual is to simply air up tires, combine trips, and drive easy. By far.
The real factor affecting mpg's is regional formulations and summer & winter blends. Much of that is unavoidable, but by FAR the easiest way to better mpg's for the individual is to simply air up tires, combine trips, and drive easy. By far.
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Sorry, had it set to restricted access b/c of the top secret nature of this information
So, Costco doesn't "apply the additives at the station" but Costco "increases the additives at the station. to 5x the EPA minimums." That is essentially the same thing I said Murphy Oil does with a loud hard sell video at the pump to purchase extra additives, but Costco simply adds to all.
Doubt EPA will allow a tanker to depart from the fuel depot without the minimum EPA approved additive package.
Curious as to why Costco adds at the station rather than let it be applied at the fuel depot where all the machinery already exists? Said to be 5x the EPA minimums so Lubrizol UltraZol 9888 is either already available at the fuel depot or Costco gets 1 part something else to 4 parts UltraZol 9888.
As I originally said, having watched deliveries at Costco, the tanker driver simply dumps his load in the tanks just like everywhere else.
that there been my general experience.. maybe in a lab with a specified set of variables, but in real world most of whatever is claimed is just a unproven claim.
Approx. 9 gallons, 16 gallon tank, but first half is larger than the second half. it was a 200 mile round trip. plus some in town driving. the car would do approx 30mpg give or take. with Costco gas it did 11mpg which sound crazy, but thats what the gauge showed when we got home and it never had an issue with the fuel gauge the entire time we had the car. I drove 83mph on the interstate every time. same amount of people and same route. the only variable is the fuel.
Sometimes my car is not running right at the start of a trip I pull over and do a Key/off, wait and then Key/ON reboot, Drives my spouse nuts!
You may have received some phase separated fuel - mainly Alky and HOH. Happens to me periodically at top tier stations.
But your milage "calculation" method gives me pause; You would need at least 5 to 7 "Drive and re-fuel cycles" to get anything approximating statistically valid data.
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