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I have a 90 Coupe DeVille and I the digital readout said 1 gallon and i put a little more than 15 gallons in, but i dont know how accurate it is. Answer The 90 Cadillac DeVille holds 18 gallons of premium fuel. I have found the digital fuel monitor system to be very accurate within a tenth of a gallon most of the time but it will read F (full) anywhere above 15 gallons.
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