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gone-ot · 03-20-2015, 02:34 PM

Yeah, I too plot both ambient temperature versus average tank milage to "see" what correlation they have...and it exits! And, the results with our Prius were rather interesting: average tank mpg's gradually declined both when <62ºF as well as when >72ºF.

This was initially slightly confusing until I realized what "driver controls" were occurring at those temperatures: BELOW 62ºF the wife was cranking the HEAT up and ABOVE 72ºF she was cranking the A/C up...with A/C-use causing the greatest drop-off in milage.

I normally do not even use A/C unless the outside air temperature exceeds 90ºF...unless the wife is riding with me.

03-20-2015, 02:34 PM	#2 (permalink)
gone-ot ...beats walking... Join Date: Jul 2009 Location: . Posts: 6,190 Thanks: 179 Thanked 1,525 Times in 1,126 Posts	Yeah, I too plot both ambient temperature versus average tank milage to "see" what correlation they have...and it exits! And, the results with our Prius were rather interesting: average tank mpg's gradually declined both when <62ºF as well as when >72ºF. This was initially slightly confusing until I realized what "driver controls" were occurring at those temperatures: BELOW 62ºF the wife was cranking the HEAT up and ABOVE 72ºF she was cranking the A/C up...with A/C-use causing the greatest drop-off in milage. I normally do not even use A/C unless the outside air temperature exceeds 90ºF...unless the wife is riding with me. Last edited by gone-ot; 03-20-2015 at 02:40 PM..