Hey - I posted an HCH speed vs FE chart a couple of months ago that I thought was ok for 55-70mph. It had pretty low noise per condition considering each condition was <1 mile and the whole test took under two hours.

Claiming that the speed vs FE curves I posted are "baseline or control" would have been inappropriate - they are just what happened during my test. I did, however feel pretty confident in stating that both speeds above 50 and AC use "kills" FE.