lol, I dunno either...
Hey SDM, remember my ole "My 2c: EV" thread...we talked about 1 bar and 2 bar. I didn't check the tachy either but lately I've been flipping between the EMPOWER and the MyView where I set the tachy. I noted that it all depends on the road and speed, a 2 bar could be 2K rpm or 3K rpm. My rule of thumb now - as I sit mostly with the EMPOWER, is about 1 3/4 bar burn after my 15mph EV start...that gives me 2K rpm. Its all relative. Somehow for me...at the end of the day....I still prefer the 2 bar (or 2.1 bar) straight burn as the sweet spot for the decent acceleration & charging...but lack the scangauge to prove this.
I don't know how much the scangauge costs, $100-$200, but for $14 ($9=OBDii $5=Torque) you can have a far more advanced interface, "Torque" for both iphone and android I believe, measures and displays about a zillion (well, maybe 100 or so) data points. Highly recommended.
Speaking of which, I've found that Torque is about 10% ... optimistic. That is, when the C-max displays 40mpg on the instant mpg bar, Torque will display about 44mpg.
Now, the good news is; even if it is not accurate to the tenths, it is still useful in that it indicates peak efficiency, if not entirely accurately, and this also explains the disparity when others have tried to replicate my 75mph peak efficiency claim, and have not seen the same 45mpg-60mpg.
I've been keeping an eye on the instant mpg readout, and while EV up to 15mph then a measured acceleration- sub-2000 rpms being the benchmark discussed in this thread as the easiest benchmark of peak efficiency, but the instant mpg seems to indicate that your previous finding of 2-2.1 bars is MORE efficient, (which makes a lot of sense really, the engineers would most likely have put the bars at the best efficiency points) as the instant mpg CLIMBS with speed when accelerating slightly more aggressively than the 2000rpm, which results in a really sloooow build to speed and then cruise (which FEELS ECO, but the instant mpg indicates is not the most efficient), which makes sense when you realize the CVT is able to adjust to higher gearing, which means less load, which means better mpg.
As has been noted many times over on the net, there is no "the" best way to drive to achieve best mpg, there are too many factors changing second by second to ever truly master all of them all at once, uphilll/downhill, traffic, temperature, weight of passengers/items/gas, wind, battery level, etc., so having that instant feedback is crucial, which is either really sloppy of Ford to have not given this tool to those in hybrids trying to maximize and game-ify their driving, or a masterstroke of publicity strategy, i.e., speedos are mis-calibrated to show 2-3mph MORE than actual, causing drivers to drive slower than speed limit, at less than peak efficiency, months pass while C-max STILL outsells Prius even WITHOUT equaling or surpassing its mpg, and becomes known as a better car in terms of style, comfort, ride, technology, etc., THEN, BLAMMO, SHOCKING NEWS, the C-max has been MORE efficient than Prius all along, but a simple error in the display made it seem as if it weren't!
Edited by MacGyver, 09 February 2014 - 03:03 AM.