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May 31, 2007


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Re: Turning off your car at every stop light - I do (kinda). I don't at every stop light, but if I come to a light that I know is going to be 30 seconds to two minutes long (the average wait time for the lights I hit on anything close to a regular basis if I see it turn red) then I shut off my engine. It makes the vehicle quieter for a few minutes as well, which is nice. I keep an eye on the lights in the other direction, and tend to start my engine a few moments before I get a green (if I'm at the front of the line) or after it turns green (if I can't see the other light or am not at the front of the line).

If I'm not sure how long it'll be or I expect it will be less than a half minute, I just let the engine idle. I realize that I am getting 0 miles per gallon when I idle, but it isn't worth shutting off and turning on for a short stop.

Just recently I had been thinking about the windows vs. AC as I primarly drive on the highway, although many times that is at a slow speed. But like you, I simply use the AC when it is too warm as I would rather be comfortable than squeeze a few more pennies out of my gas mileage.

Although I just filled up the other day and my tank of gas cost me over $40 and I have a Scion tC with a 12 gallon tank. Gas in my area is now around $3.60 per gallon so I might need to try and take advantage of more work-at-home days.

Mythbusters (Discovery Channel) did 2 episodes on the A/C vs windows down and found that under 40 mph put the windows down. Over 50, use A/C. In between, it doesn't matter much. It depends somewhat on the type of A/C and the body shape of the care. I usually avoid the A/C and drop the driver window and passenger rear window just a bit to get cross-ventilation.

On Wednessday, June 6th, they are testing drafting behind big riggs.

"Tip: There have been additives, special magnets and even a pill that has promised to improve a car's fuel efficiency by as much as 30 percent in some cases."

I find it very frustrating that consumer reports claims additives do not work, when there are hundred thousand dollar independent studies showing their benefit.

Check out this article before purchasing any oil additive, because it is true that many have false claims giving the good ones a bad reputation.

i love mythbusters and saw the same episode.

the only caveat to stopping and restarting your engine is the extra wear on things like your starter

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