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Where can you see the oil life remaining percentage on an H3 without a Tech 2?

With 2500 miles, 76 percent remaining could be accurate. All depends on the ambient temps, how long the engine is run between ignition cycles, etc. If you are taking long trips at constant speeds, the oil life does not increase that quickly. If you are taking one or two mile trips, in the middle of winter, not allowing the engine to warmup, the oil life will decrease rapidly.
The alorithms are pretty damn accurate and GM has tested this system over and over to prove it is accurate.
Just have to make sure to use oil that meets or exceeds the oil spec supplied in the owner's manual. Using a lower grade oil will not result in accurate oil life display since the oil life monitoring system, is based on an oil that meets the GM spec. (Using an oil that exceeds the oil spec given, will cause the system to be innacurate, but at least it is innacurate in that the oil would not have to be changed as often.)