[skyking]

Originally Posted by rmay635703

https://www.machinedesign.com/archiv...lanes-are-here

The 42mpg airplane has been hyped up for what ?
Over a decade, I think it’s more an issue of willpower, getting a tdi approvedfor the air is likely a pain as well

the 310 would get a solid 11 MPG at 21 squared, but you'd get 13 or so if you feathered one and ran the other at 2300 RPM or so. I never went that route
I would daydream about a pair of those zoche 300 HP diesel radials. The ones that never got out of testing :facepalm: