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I've been running AC a little here, 82-90ish temps outside and AC set to around 80-82. It drops the instant right away, but once it runs a bit it seems to have a pretty low effect on overall mpg. I'm one that normally drives with the windows down, so I guess I'm more used to being hot in a car. I've hit 50-55mpg for most longer trips with ac on according to the scan gauge. I wasn't going as slow in those cases so not a great comparison. It seems like driving a little faster offsets the AC "tax" a little, less time it's on, less fuel used. It's probably quite a balancing act for speed vs ac draw over time to work out the best speed for the given situation and such.
I wouldn't mind hitting 60mpg for somewhat "normal" driving, ac on would be a nice bonus. I think it should be possible though.
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