I did notice a massive decrease in performance in the nice hot weather.
I have noticed it on other cars, but my 145 seemed really badly affected by the hot air.
The air con does consume a lot of power, and makes even more difference going up a hill.
Well now the sun's gone, the rain has come & bought some cooler, fresher air with it, so the car runs well again.
Guess you can't have it all - sun, good performance, birds out hardly wearing anything.
Instead - settle for rain, cold, good performance....enjoy your car wink