I had the opportunity to test drive a 2009 GMC Yukon hybrid SUV last week, and I learned first hand how incredible the Two Mode hybrid transmission really operates. While I won’t go into all of the technical details of this hybrid system here, those of you who are interested can learn more at Wikipedia. Bottom line - had I not known I was driving a hybrid vehicle, with the exception of the engine shutting off at or near stops and the 50% improvement in gas mileage, I really couldn’t tell much difference between this version and the gas-only model. Previous hybrids I’ve driven made it much more obvious with their spongy braking, clunky transition between electric and gas power, and annoying hybrid noises.


