Thanks, I tried a search but what came up was not exactly what I was looking for. As for the per tank I kinda want to compare those of others to my Dad's records from when this car was new and as it got higher miles on it.
Alan

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92 500E Silver 66k
82 Porsche 911SC 84K
68 Cadillac ( Gone Now )
03 Suburban Z71 200K
85 300SD 217k From Original Owner ( Dad )