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Some thoughts. Make sure the system is not overcharged, more work for no gain. Try to get Dad to use max AC plus recirculate with lowest tolerable fan speeds. Best method is to use the compressor when you must decelerate so the lost energy is converted to cold evaporator temps. Recirculate is the key to cooler air with lower energy cost since once you get the humidity out the air is much easier to keep cool. Cycling the compressor on and off may be too much work for Pop but it would also help to improve mileage. You may find that the mileage he is getting is not that far off from the best you can expect unless you really concentrate on efficient driving and best AC use strategy.
regards
Mech
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