well, It seems that A/C effects smaller cars more than bigger cars, cause the bigger engine takes the load of the A/C better than the smaller car. (which is I think the reason the smaller cars like the Prius got their FE impacted the most than to the big v8 vehicles with the new EPA ratings.)And it doesn't require me to have the windows open, which for a vehicle with huge windows, and a really bad Drag Coefficient to start with, does less damage than with windows open. For city driving, I crack the windows, for highway, vent on.
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