zlacker

>>CGMthr+(OP)
I cannot stop thinking about the fact that air travel wastes so much energy, just to float. Buoyancy is free.

It is insane that we are not doing materials research on how to capture vacuum in thin cavities.

>>whatev+QK2
Modern jetliners get a higher miles per gallon per seat than most US (ICE) cars. They easily beat any ICE car with a single occupant in miles per gallon equivalent. If you want to minimise fuel usage and can't find someone to share with, it's better to fly! The issue is almost entirely the distance travelled.

>>SPICLK+jP2
Cars also waste energy just to overcome friction while most of the times they do not change momentum (go straight at constant speed). But this is a discussion for another tire.

>>whatev+iR2
Aerodynamic drag accounts for more energy losses than tyre friction (and tyre friction can be relatively easily changed with tyre pressure or tyre type).