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I had an idea a while ago that might help convince people to go slower and save fuel. What if every car's speedometer had a highlighted green zone from say 35-55 mph that slowly changed to red as speed increased so people would have a visual cue to how they can save the most gas? I think it would be neat if all cars came with that, that way people tearing along at 75 mph would see the needle well into the red every time they looked at the speedometer. Getting people to think about their wallet is usually easier than getting them to think about the environment.
I also want to echo a sentiment from earlier in this thread about how little time speeding really saves you. Even going 10 mph over the limit on a 1 hour drive only saves about 8 minutes. Is it really worth it?
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