answer:Speed limit means just that—the upper limit at which you can legally drive. Some highways have posted minimum speeds. Drivers are free to travel any speed between the two. Since the gas savings between 55 and 65 MPH is significant, I can see why people may well have gone back to it. As to the left lane, conventionally it is the passing lane and should be kept open for cars going faster to pass slower traffic. More and more drivers ignore that convention to the detriment of all these days, which encourages speeders to recklessly pass on the right and weave in and out of traffic. I have never seen a sign that says left lane reserved for the people who go as fast as tinyfaery thinks they should.