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I'd just coast down to those lights. 30 seconds or more is worth it, depending on the car. 10 seconds is rather marginal. Pulse-and-glide between lights properly and you shouldn't even spend any time stopped.
The weight of the spare has an effect, but it's not much. I'd take it out if you were going to the racetrack. On the street, it's probably not going to make a noticeable difference.
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