Before anyone can tell you if 92ma is normal, you need to provide more information about your particular Trailblazer. Is it 4x4? Is it equipped with OnStar? Do you have any aftermarket accessories?
I own an '04 LS 4x4. I can check my normal draw as a comparison but I want to know if we’ll be comparing apples-apples beforehand.
Your TB is equipped with a power saving feature that is supposed to prevent the battery from being discharged enough that it cannot be started. However, this system only works if the battery is in good shape and the charging system is working and allowed time to replenish the lost charge from starting. Infrequent, short trips are killers for batteries and as it sulfates, it will spiral downward rapidly. 4-5 years is not outside the unexpected time for a battery replacement in those situations.