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sorry but my 2022 hybrid shows noticeable and repeatable improvement/worsening of mpg
by messing with s-flow and/or eco button (not eco drive mode, eco button on a/c controls).

4 to 5 mpg sometimes. I do the same 10 mile trip twice every stinking day and know when my mpg is 55 or 50.1
by doing exactly same driving and several rounds of tests with my a/c modes. temp fixed at 64 in the display, 90-92deg outside.
1/2 my tests I throw out because traffic situation required a change in throttle or cruise.

all 'clean repeatable runs' I did show me mpg improvements or losses

eco a/c mode works and s-flow works to save gas.
You can believe it, I don’t. Nor do I believe you are getting 55 mpg from the ICE energy alone on a repeatable basis unless you hypermile in slow traffic. Yes, those a/c settings “work” to improve efficiency, but not that well. As I wrote, the a/c is electric, not belt driven.
 
Absolutely nothing can be done to both save me any energy or get any sort of proper cooling out of the R4P in a Texas summer. I've been absolutely suffering in this thing all summer to the point of driving my Lexus GX460 more guzzling petrol but has a brilliant AC just to keep from frying like an egg in my prime. And this of course has a huge impact on range. At least this is only my 3rd small complaint of the vehicle. :)
 
One thing that I think is often overlooked is that while individual energy savings might be smallish, the aggregate effect of many of these smaller energy savings can really add up to a much more efficient car.

A little here, a little there and soon you are talking about a significant amount of energy savings.
 
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