Paul - Like Tiger Joe says the GM oil monitor looks at several different variables to calculate remaining oil life. Variables include a crank revolution counter, number of cold starts, engine revs accumulated while running with oil below operating temperature vs running at optimum temp, some sort of average engine load calculation (a heavily loaded engine "uses up" oil life faster loaded engine), and probably a few more.
I agree - short trips, especially in cold weather, will dramatically shorten calculated oil life. For example my wife's Chevy Impala (driven mostly long distances at highway speeds) routinely displays the change oil message only after 9,000 - 9,500 miles. But the elderly woman across the street with the same car barely gets 2,500 miles before the message appears (she drives only every a couple miles to the store, church, bingo, etc). Her car probably NEVER gets fully warmed up.
Incidentally the ScanGuage II aftermarket automotive computer I have on my wife's car can peek into my car's ECM and display in real time the calculated % remaining oil life.
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