Also, temperatures have started to go down, more cold air in>>more HP out . That and you usually stop using the a/c as well, which the compressor takes well over 5 hp from the engine.

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"If everything seems under control, you're just not going fast enough"
-Mario Andretti.
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River City Bimmers Chapter
2005 X3 3.0i ZPP, Htd seats, Htd strng, Black Sapphire on Terracotta.
1995 ///M3 Coupe, Lux, MT, Htd seats, Cosmos Black on Black.