Not sure if you've flown yet, but if you're still looking at a longish layover at MCI (like 1:45) I would not hesitate to leave security and hit the bar/restaurant in the terminal, provided your arrive is not especially delayed. Been to MCI lots of times and have never had much wait at security. I would not consider leaving the airport. If you're interested in a bar/restaurant in a different terminal there is a free intra-terminal shuttle, but in my opinion 1:45 is a little tight to venture that far because you're at the mercy of that shuttle.