There is some debate on whether or not truck caps improve gas mileage. Some say that they do, while others claim there is no significant difference. However, there are a few things to consider that could sway the argument in favor of truck caps improving gas mileage.
For one, truck caps provide aerodynamic benefits. By reducing drag and turbulence, a truck cap can help a vehicle move more efficiently through the air. This can lead to better fuel economy, especially at higher speeds. Additionally, truck caps can keep cargo from shifting around in the bed of the truck, which can also improve gas mileage by preventing unnecessary weight from moving around while driving.
Another potential benefit of truck caps is that they can keep the interior of the cab cooler in hot weather. This can reduce the strain on the air conditioning system, which could lead to improved fuel economy as well. Additionally, if you regularly transport items in the bed of your truck that need to be kept cool (such as food or beverages), a truck cap can help keep them at a consistent temperature, which could also save fuel by reducing the need for frequent stops to cool down or heat up your cargo.
Ultimately, whether or not you see an improvement in gas mileage with a truck cap will depend on a variety of factors including your driving habits and conditions as well as what type of cap you choose and how it's installed. However, if you're looking for ways to increase your fuel efficiency, adding a truck cap could be worth considering.