https://www.aero-coach.co.uk/inner-tube ... resistance
Cutting rotating weight by upgrading my stock wheels (~2100g to ~1550g) made a huge difference, I'm hoping cutting another ~70g per wheel of rotating mass will help me gasp and wheeze my way up the hills at a snail's pace a tiny bit easierSUMMARY
In this updated test we found that there was a large difference in rolling resistance between different models of inner tubes, with standard butyl tubes being the heaviest and the slowest on test.
Latex inner tubes outweigh any small penalty from ultra light tubes like Tubolitos or a Continental Race Supersonic as the rolling resistance with a latex tube is so much lower (better). One small drawback with latex tubes is that they lose air overnight and require pumping up before a ride - so if you want to have an inner tube that's a little bit faster than a standard butyl tube and doesn't require daily inflation, Tubolito or Continental Race Supersonic would be two alternatives.