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Yea, that's one of the main reasons I used it on the way home today after helping a guy do some farm type work. 75F and 45mph I got about 48mpg, same trip in the past was 56mpg with no ac. Roughly 20% increase in fuel usage for me, but I guess I have the AC turned up too much lol, it was full fan speed for most of the trip, I started with the windows down to let the hot air out. Car is white so it doesn't get crazy hot inside either.
I also recently read that the AC pump can draw up to about 10 amps from the hybrid battery, at 202v that's 2020w, just what I read online though, so no proof or anything. That's about 2.7hp which seems to make sense and that's drawing off the battery, not counting the inverter and charging losses, so will have to add 10-20% to that figure for the actual draw on the engine and probably a bit more for the charge/discharge cycle on the battery.
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