I know this is really off topic, but with the rising gas prices, I`m trying to find a way to get ahead at the pump.
Currently, our gas prices in HI are about $2.45 for premium and about $2.20 for regular. Costco sells its gas at $2.12 for premuim and under $2 for regular but the lines are long (approx. 10 min. wait).
I have two questions that I hope someone can help me with: 1) Is there a difference between Costco`s gas and Chevron`s gas?; and 2) does the grade of gas (i.e. premium v. regular) make a difference in gas mileage. When I spoke with the attendant at Costco, he said that Costco gas does not contain all of the same additives as other gas, but does contain Costco`s own additive. As for the mileage thing, I read a letter to the editor today where the writer claimed to get an additional 13 mpg on premium in a Buick Park Avenue. I`m extremely skeptical about his results, but I have found that premium might get me another 2-3 mpg, but I`m not sure why. When I crunch the numbers, it almost seems like it`s a savings to put in premium over regular. Any comments or thoughts?
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