My car never used AC regardless of outside temps, but I did have to remove all grille blocking once outside temps reached above 90. Didn't notice any significant MPG drop other than that due to slightly poorer aero from the grille block being removed.
EDIT: The warmest weather I've driven in was 96-99 degrees Fahrenheit; nothing over 100, so I may not be experiencing what you are.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
Last edited by mpg_numbers_guy; 08-27-2018 at 10:31 PM..
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