Went to do some A-B-A testing today with & without the grille blocked, so started out with 3 "baseline" runs at 55 mph for the initial "A" test.
First dissappointment - averaged only 46.95 mpg. Although it was climbing about 0.3 mpg each time, so maybe the "system" was still warming up - would a 4th run have been even higher? Dunno, because....
Second dissappointment - Just as I was finishing up the last "baseline" run, I got a call from my elderly parents that they were in town and just heading over to eat. Well, 1st, I cannot pass up a meal, and 2nd, I shouldn't "blow off" my elderly parents.
So, it looks like there's "plenty of room for improvement" if I want to be able to do "55 at 55", my initial goal (55 mpg at 55 mph). ... and of course, I still don't know what effect the grille block will have.....