You are driving in traffic on a road with two or more lanes in each direction. You should
Choose an answer:
A. Avoid driving in someone else's blind spot. Speed up or drop back so the other driver can see you.B. Drive beside or just behind another vehicle, in their "draft", to improve your gas mileage.C. Drive a little faster than the speed limit so nobody tailgates you.
This is the safest option. Driving beside a vehicle does not provide fluid energy reduction. Driving above the speed limit is illegal, and tailgating is not an imminent threat.