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Originally Posted by dilloduck For those of us who drive not-so-aerodynamic 4 cylinder trucks with a sliding rear window, running the A/C is still worse. Maybe if I was at the indy oval and someone to draft off of.  |
That is true, if your car is not aerodynamic You may use more by running the air, but then would point out, if your truck is newer, the air conditioning does not use nearly as much gas as older models.
I suggest you try what I did. Next time you make a trip, do it both ways and test the millage you get. Then you will know for sure.
I will say that when I am driving truck(semi) over the road. The truck seems to get about 7MPG with or with out the air on. As long as I keep it at about 58 to 60 MPG and use the techniques taught to me by my employer to save fuel.