Interesting thread. A-B-A tests have been reported here and elsewhere as a great way to calculate the fuel efficiencies of aerodynamic modifications to vehicles.
In this thread it is discussed things like atmospheric conditions (winds, temperature, etc.), even the aerodynamic effect of other vehicles upon the test vehicle, actively engaged in a test, may have an effect on the results of the test.
I have often wondered if the very cold temperatures and brisk cross wind may have effected this A-B-A test, which was also determined in just one day. From what I have read in this thread, my thinking is that Fubeca's test may be very flawed indeed, which he has actually agreed to. Not to belittle Fubeca for the hard work and fine job he did on his aerocap, he just needed better atmospheric conditions on the day he ran the A-B-A test below.
http://ecomodder.com/forum/showthrea...ead-11611.html
Bondo