I think you already know the answers, judging from your post. Running the AC and leaning on the throttle, dad is keeping it out of lean burn and using a lot of power for accessories. To be sure, either he can learn to drive hypermile or you could swap cars for a week, as you're suggesting. And post pics, man!
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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