what everybody said so far, it's quite variable
my oil consumption with 115,000 miles is the same as it was at 50,000 miles and 25,000 miles, sometimes I go 3 tannks of fuel and don't have to add, other times I go 100 miles and have to add a half quart
I generally never add more than a quart between oil changes (3500-4000 miles)
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