So I never gave too much thought to inner tubes, just grabbing whatever fits. I think I currently have specialized turbo tube (at least that's a spare I have, I could just as easily have another type in my wheels). I just weighed the spare tube and it's 79g, so I guess pretty lightweight and maybe comparable to the continental race light here (
https://www.aero-coach.co.uk/inner-t...ing-resistance) and maybe similar rolling resistance (bad assumption, I know).
I'm attempting a PR on 100 miles in a few weeks so I'm kind of going for the low hanging fruit, I may check to see what tubes I actually have installed. I'm not really willing to try latex at the moment (just don't want to mess around with something new). Might get conti race light since there is rolling resistance data on those.