In the public, I wear sunglasses and a hat. I don’t park in area’s that have lots of cameras. Also don’t try and stand out, don’t wear to flashy clothing, but try and match a little.
For at your home, if you have a garage, park your car in the garage, that way when you leave, neighbors don’t know your gone, or when your home. Also make sure to install some sort of lock on your garage door, but make sure it’s not electric, found that out the hard way. If you live in an apartment complex, park your car out back if you don’t need to carry anything in.
IRL privacy in winter is super easy, wear some layers, hat, sunglasses and gloves.
Some notes for you, standards change were you are, so reflect on the advice your given. For example, I live in the States, but some might live in Europe, cars are different, dress standards are different, stores are different, etc. So some pieces of advice that might be rock solid in one place, may not be wise in others.
I have a 06 jeep wrangler, used to do 20 mpg but gets more around 15-17 now, which I plan on making some efficiency improvements. But its a pretty reliable engine and I live in a rural area so having an all terrain vehicle gives me some piece of mind.
If your planning on getting an older vehicle, do some preventative maintenance such as a new battery, make sure amps are equal or greater. Change the oil if it hasn’t been done. Get new belts. Get new spark plugs. Get a decent set of tires. Use fuel system cleaner.
If you plan on getting a newer vehicle you could probably pull a fuse to disable it from transmitting, but I don’t know if it would actually work.