What is the best position of carrier on roof rack for optimal gas mileage?

There is no definitive answer to this question, as the optimal position of a carrier on a roof rack for optimal gas mileage may vary depending on the specific vehicle and carrier in question. However, some general tips that may help include:

1) Positioning the carrier as close to the front of the vehicle as possible can help to reduce drag and improve gas mileage. This is because the closer the carrier is to the front of the vehicle, the less air it will have to push through as the vehicle moves forward.

2) Making sure the carrier is securely fastened to the roof rack can also help to reduce drag and improve gas mileage. If the carrier is not securely fastened, it may move around in the wind and create additional drag.

3) Removing the carrier when it is not in use can also help to improve gas mileage. This is because even an empty carrier can create drag and reduce gas mileage.