Quote:
Originally Posted by Maxbumpo
I haven't really seen any difference. I'm convinced that the increased aerodynamic drag of opening the windows and sunroof will increase fuel consumption more that the AC will.
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I've read studies that this is true.
Winter diesel does worse on mileage because of the blend, so when you switch to better fuel, but using the AC, for me its generally a wash.
My girlfriend seems to pick up 1-2 mpg in the 190D in the spring and fall when the windows are up and the A/C is off, but not necessarily on winter blend fuel.