Originally Posted by willowbilly3
There is a lot more to mileage than the speed, as we can see from the posts. However if you have a car specific built to a lower speed then it should get better mileage at the lower speed. Sure everyone wants to keep driving fast, we are in a hurry. Maybe we should run a 55 lane on the service road and just open up the interstate like the old autobahn. Then you could be part of the carnage or not. Already the metros are kind of that way. We never go near Dallas during peak traffic because you know that you will be setting still for 2 hours while they spatula someone off the road. Might as well go the secondary roads through the small towns and enjoy it.