Is it better to keep older appliances/cars longer to cut down on waste or to buy new energy efficient ones?

I have a 2003 Honda Civic that is fuel efficient and runs well. However, newer cars get even better gas mileage. We also have older appliances in our home that still work reasonably well, but would it be better to purchase new energy efficient models?
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How to use electrical appliances while im in San Diego?

I use 240V appliances. How can i use it in USA?

How can I install an outlet to use European appliances?

My house inspector noted in his report that the meter reads 240V. Is there a way of installing an outlet that would allow me to use European appliances and tools (possibly high wattage) without a converter?

do miss matched appliances bring down the value of the house or does it not matter?

I have a large house about 6000 sqft of living space, but my kitchen has a stainless steel refrigerator and the other appliances are bisque.sooooo just wondering if it would really affect the value of my house.

How much money do you save by unplugging unused appliances? Does electricity really flow through unused items?

I just don’t understand how or why electricity flows through unused chargers and plugs to unused appliances. Does anyone have any information on this? Also, how much electricity flows through?