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this post was submitted on 15 Jul 2023
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as if the first thing I'd do wouldn't be to hotwire the compressor engagement into an off the shelf temperature controller.
I don't really see the point of that other than punishing people for driving (which in the 30 years I've lived in the US has not once been a choice between driving and mass transit). It's a marginal difference in fuel consumption at best.
Measuring the commanded torque from my ECU it's about 1-2 lb-ft difference.
A lot of propositions would only make marginal differences. Does using A/C in cars emit more GHG?
Not enough that the average person couldn't make it up elsewhere with far less inconvenience. You could just leave more following distance, start coasting to stops earlier and accelerate gradually and save a lot more fuel. Most people drive like methed up maniacs.
Driver education, and proper vehicle maintenance would go much farther and actually improve safety and comfort. Most people don't even check their tire pressures once a week, month, year.