Mine gets pushed daily and still comes back asking for more

I have noticed that on hot days the car seems to not run as "powerful" as on cold days... I've owned other BMWs in the past but they were 6's. Anyone experience the same with their X? 6 or 8.
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Say what you will, nothing drives like a BMW.

2003 X5 E53 4.4
2001 740iL Sport
1990 325i E30 - Restored/Restoring