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The bigger the difference between inside and outside temperature, the bigger the heat loss between the two. The ac running the whole time has to overcome the perpetual loss. If you turn it off, it only has to overcome the temperature gradient one time when it comes back on. It's almost always better to turn it off when not needed.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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