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Idk what exactly u want to know. But i have a 2000 Cadillac deville and i put mid-grade in the tank but regular does work fine with no problems. The mpg varies from anywhere between a high 17 mpg to close to 20 mpg because the dash is digital and it changes often depending on your driving. Its not too bad for local driving and the cruise control on mine never worked so im sure by using that you save more gas also. Hope this helped
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