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An A/C unit will need to dump the heat somewhere... which makes me think it won't be as helpful as it can in such an enclosed space as a car. If humidity is a problem, I'd use the in-car A/C sparingly. Otherwise if humidity is low, a portable fan that uses less power/generates less heat would be my option.
But then again, you look like you're doing pretty well on MPGs. A little AC and/or window crack wouldn't hurt in small doses.
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My 5 pillars of fuel efficiency:- driving style
- aerodynamics
- tires
- weight reduction
- engine maintenance
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