[Kobura]

Just returned from a trip to Sequoia NP. Filled up the family car with gas from the Costco in Gilroy, CA which the previous poster noted has the Kirkland additive. It made a noticeable improvement in the engine performance as measured by about a 10% increase in mpg. I had noted a previous performance gain by getting Costco gas at another location which has the additive, but was not aware of the difference in the gas from other locations. I am sold on the Kirkland additive! Gotta try it on the Cobra.