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Old December 9th, 2018, 08:27   #6
Veteran Member
Join Date: Nov 2005
Location: Illinois

My car runs better after a few minutes of warm-up and I do LOVE sitting in a warm seat when the heaters are on. That, to me, is worth the fuel spent idling.

But it seems I achieve my best MPG in the heat of the summer, when humidity is nearly a mist in the air and I have the AC blasting. It would be my assumption that cool crisp dry days would be the best for combustion, but it just doesn't hold true on my car.
2010 JSW TDI DSG in gray with black interior

2009 JSW TDI DSG - sold back to VW
2002 VW Passat Wagon, 6spd, silver Family hauler! - Euro Spec

2006 Jetta TDI Bought 6/25/06 (traded in 10/2009 @ 43mpg
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