2 questions

[Arragonis]

Have you tried pulsing the AC, basically using it when the engine is not doing anything else or when coasting downhill ? I have done this with the Aygo mainly as this is the first car I have had where AC does diminish performance enough to be felt.

[Weather Spotter]

I do that when I use it. I run it flat out and then it dies when I coast to a stop. so it is off for a minimum of 1/3 of the time.

[manguela]

Yes, in downhill situations is always good idea to refesh the car and turn on the AC.