[redpoint5]

Both of these posts below imply an ambiguous fact.

Originally Posted by 101Volts

Off-topic a bit, But buying a new car will have more of an impact on the environment than using a beat up sedan from the 80s for 20,000 miles or so I read.

Positive or negative impact on the environment?

Besides environmental concerns, there are financial ones as well, among many others.

Originally Posted by PressEnter[]

It looks like Fuelly has gotten in the Mythbusters spirit...did anyone else see their current tip on the home page:

Tip: 50/50 rule--updated | Fuelly

Although Mythbuster has "proven" that it is more efficient to have the windows up at 50 miles an hour and higher, likely their test was done with a car with belt driven A/C. This rule will not be true with newer cars that have electric A/C.

In what way will the rule be broken for cars with an electric A/C? Will it be more efficient to drive with the window open at higher or lower speeds than 50mph in this case?