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Prius Owner (not verified)    September 6, 2019 - 4:28PM

Costco gas is on this top tier list? Not from what I've experienced. In my previous car (before my Prius), I ran three tank full of Costco, and then three tank full of 76. There was enough difference in mileage to make the 76 gas actually cheaper than Costco. But don't just take my word for it, run your own test and see the difference in mileage.

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