It's extremely rare that it's cold enough to need to use cabin heat. Maybe if it's below 40 degrees. There won't be many mornings that cold.
My typical usage is a lot of city driving and 5-13 jobs each day where the car will sit for 15-40 minutes typically. A fair bit near an hour, so the engine does cool down a bit on cooler days. Today the engine ran (in my mind) excessively when exiting a parking space/lot.
I'll buy a bluetooth obd2 reader, sounds like a good idea. I wanted engine rpms too.
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