I’ve been averaging about 25 to 30,000 miles a year for the last 25 years. Driving in the left lane is illegal in just about every state. The left lane is for passing ONLY. if you hang out in the left lane, even if you are going the speed limit, you will get a big fat ticket. In fact you are probably going to be the cause of many accidents or almost accidents.
If you want to drive like a grandmother, get over into the right lane where you belong. Leave the center and left lanes for us professionals.