|
It makes a huge difference. 7 seconds idle = 1 start up. If the light just turned red, chances are that the light will be red for more than 7 seconds, so you can turn the car off. 1 gallon per hour, times 1/60 (assuming you wait at a light for 1 minute) and you go through 6 stoplights on your way to work, and 6 more on your way home. That is 12, and at the end of the week you will be up to 60. So 1 hour wasted just sitting at red lights. That is one gallon, 14 miles that your truck will not go.
Assuming that you use 11 gallons (way less than when you fill up, this is what I fill up to though) at 14 MPG, but one of those gallons is wasted at stop lights idling, you will be at 140 miles. If you had turned your truck off at each stop light, then you would be up to about 154 miles.
When you key off, just shift to Neutral (won't hurt the tranny) then key off then back to run. The "hey stupid, your car is wasting battery" lights will come on, but if you have a functioning alternator it won't hurt you.
When the car is cold DO NOT DO THIS! It will cool the engine down when you key off, and then your car will stay in fuel enrichment mode until it gets up to operating temperature. Also don't run your AC/Heater when the car is off, it cools the engine off really fast.
__________________
|