Originally Posted by Modshack

Exactly.....As I said in yet another thread on this, Very few manufacturers will give you the time of day if you're not burning more than a quart/1000 miles. Chevy (for the Corvette) even has a published bulletin that says 1 qt per 500 miles is acceptable if used in an aggressive manner (aggressive being defined as operation above 3000RPM's...LOL). A quart between changes, or even 2 in a 3700 mile change interval would not be considered excessive enough to warrant correction with most all companies...
When you get into the serious usage area (exceeding a Qt/thousand) they will do a monitored test by documenting miles and sealing your oil fill to determine true usage.