Of course, the actual number differs depending on engine, etc., but everyone says it's really close to actually being 55 mph. At least, above 60 mph you're wasting lots of fuel efficiency. The difference between 55 mph and 75 mph is almost 20% fuel efficiency.
Sure, you might have to leave earlier, but isn't that sometimes worth it for the safety and extra cash that driving slower provides, not to mention the impact on the Earth that comes from using less fossil fuels?
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