Stop Light MPG Question. - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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View Poll Results: what's more economical
GO! GO! GO! 17 60.71%
STOP! 4 14.29%
wtf? who cares? 7 25.00%
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post #1 of 10 (permalink) Old 09-20-2010, 07:58 AM Thread Starter
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Stop Light MPG Question.

bored so I'm asking. if you're approaching a stop light that is about to turn red. You can either crank up the RPMs to gain about 10mph to make it (assuming you're legally making it) OR slam on the breaks come to a hardish stop and accelerate slowly out.

which is more economical?

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post #2 of 10 (permalink) Old 09-20-2010, 08:09 AM
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smooth and steady



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post #3 of 10 (permalink) Old 09-20-2010, 08:22 AM Thread Starter
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Quote:
Originally Posted by camopaint0707 View Post
smooth and steady
I was assuming smooth and steady runs the red. but agreed if it's enough, than it's the best course of action.

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post #4 of 10 (permalink) Old 09-20-2010, 08:23 AM
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anticipate the light turning way before you even get near the light, start slowing down and go in there slow enough that you'll still be moving by the time the light turns green



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post #5 of 10 (permalink) Old 09-20-2010, 09:08 AM
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Depends, really, if I'm far enough away and it turns yellow, then it's a nice coast down to a stop, especially if it's way before. If it turns yellow and I'm within like two telephone poles (these are spaced accordingly), I'm going through it.

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post #6 of 10 (permalink) Old 09-21-2010, 01:03 AM
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I've done several tankful runs to figure out what works for me... For me, I get the best mileage when I Jack rabbit start to get up to speed, and coasting to stoplights. If its gonna turn yellow, and I can't make it, I just stand on the clutch and brake. But If I can, I drop it in third and go.

My average tank like this gets me 350 miles around town stop and go, if I did it the sunday driver way where I ease up to speed I only get 300 miles to the tank. Next time your at a light, reset your eco gauge, and just as it turns green and try a jack rabbit start, vs a long drawn out crawl to 55mph. Getting to the sweet spot in mpg faster means longer at that sweet spot. Taking forever to get there means it is going to take that much longer to average out to the mileage you prefer.
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post #7 of 10 (permalink) Old 09-21-2010, 03:16 AM
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If you know hammering down will get you thru the light safe and legal then do so. Under hard acceleration you will get 5-10 mpg. If you stop you get 0 mpg for the time you are stopped, and you take the mpg hit of starting back up

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post #8 of 10 (permalink) Old 10-30-2010, 08:01 AM
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You'll most likely use slightly more gas idling at a stop light and accelerating back up to the speed limit once it turns green compared to the little extra gas used to legally speed up to make the light.
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post #9 of 10 (permalink) Old 11-10-2010, 04:40 AM
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If you kill the ignition while waiting at the light you use NO gas! So kill as you approach the light and coast into the red with using zero fuel.
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post #10 of 10 (permalink) Old 11-17-2010, 04:42 PM
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Kind of confused here... You either have to slam on the gas to go or slam on the brake to stop. Sounds to me if you need to do a hard stop you can coast at speed through the light and don't need to gun it. In which case, go through at a correct speed rather than stop.

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