60 mpg is pretty exceptional for an HCH1. You're either a very good hypermiler, or you have a very inaccurate mpg meter.
Regardless, to get that kind of mileage, you must be at a very low average power... probably on the order of 9-12 hp. A/C consumes about 3-4 hp. You can see that's a huge % increase in power.
While you may feel compelled to use your A/C less for better mileage, consider that the battery is cooled by cabin air. I always say, "if the driver and passengers aren't cool and comfortable, the battery is being damaged."
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