On a 87-92 Mustang using a quart every 3k miles is normal. Forged Pistons with soft rings cause oil use. When my car was new and after break-in it was using a quart between oil changes. I have over 145k on it now and it uses a quart every 2k miles and if I use 20W50 I get 3k miles.
Actually, mine seems to lose its oil just when i am being hard on it. I suppose its normal as it doesnt smoke or anything. If i drove like a wuss all the time it probably wouldn't lose even a quart at 3k.
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