In my experience, I picked up exactly 1 mpg with the Horton fan clutch. Even when towing in hot weather. Although yes it engages at 100%, it never stays engaged for more than a minute or two and then it is 100% off. A viscous fan clutch, in hot weather, will be engaged to some extend regardless of weather your truck requires any cooling or not. The Horton on the other hand, only engages when your truck needs cooling, whether it is 10 degrees out or 110 degrees. So it translates into better mileage in all conditions.
Given that it engages at 100%, when you do need air flow, it is also more effecient than a stock type clutch which only engages to approximately 80% at most. As I said, my fan never runs for more than a minute or two at a time.
They are very spendy however. I've got over 200K on my fan with not a single hiccup and it has certainly paid for itself at this point.
Given that it engages at 100%, when you do need air flow, it is also more effecient than a stock type clutch which only engages to approximately 80% at most. As I said, my fan never runs for more than a minute or two at a time.
They are very spendy however. I've got over 200K on my fan with not a single hiccup and it has certainly paid for itself at this point.