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Along with something you have like a credit card you should be required to provide something you know like a pin number.
I buy my gas pretty much exclusively at Costco when I can, since they seem to be aware of the skimming danger (their pumps read the stripe rather than the chip, at least where I am, so shimming isn't an issue yet). Their pumps always have red tape sealing the card device to indicate that it's not been tampered with.