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? If you could provide websites that support your answer, that would be great.

How much current will each of these appliances draw from a 120 V circuit?

How much current will each of these appliances draw from a 120 V circuit? A.1200 W steam iron B.600 W, two-cup coffee maker C.60 W stereo D.40 W lamp What will happen if all the appliances listed in question above are used on the same 15 A circuit at the same time? Explain your answer. Thank you!

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?