Power consumption in the heat

Have tested it several times now at 32-35 degrees according to Temp. Display. But more than 235-240 does not work at the moment. Usually there are always 255-260 at 23 degrees. I find the loss of power quite crazily. How do you look at the moment? 20km/h Difference must be minimum 20ps less. Does a CAI work there miracles ?