It is estimated that tonneau covers reduced the coefficient of drag by enough to save over 10% of the fuel cost versus driving a truck with the tailgate up and the bed uncovered.
The Advantage Truck Accessories, manufacturer of the Torza Top, has a calculator on their site to help you calculate savings. The link to the calculator is included in the related links section.
Most tonneau cover manufacturers claim that the tonneau cover saves about 10% in gas over running your truck with the bed exposed and the tailgate up.
Here's a site that sells a variety of different tonneau covers by mail order: http://www.truckchamp.com/tonneau-covers
Soft Tonneau covers range from approximately $300 - $500. Hard Tonneau covers are double the price, ranging from $600 - $1000! There are other varieties, but these are the two most popular.
New Tonneau Covers sell from $164.95 plus shipping.
The most reliable brand of truck bed covers is Tonneau. Tonneau offers organized storage for items, coverage from potentially damaging weather, and improves gas mileage. Also, Tonneau truck bed covers are useful in any situation.
Hard tonneau covers are made out of thermoplastics. Soft Tonneau covers are made out of weather resistant fabrics of various types, most usually coated with PVC or made out of Vinyl.
Tonneau covers are very reliable depending on the one you get. There are soft ones and hard ones. They can reduce theft and weather damage to the things you are carrying and can also reduce gas mileage.
When shopping for tonneau covers you should always shop for materials that are durable and stain proof. You should always compare price online.
You can find truck tonneau covers at Auto Anything online at (http://www.autoanything.com/tonneau-covers/10A50174.aspx). They have covers that fit all sizes of beds and you will want to order the one that is specifically for your make and model of truck for the best fit. Another site to check out is TruckChamp.com at http://www.truckchamp.com/tonneau-covers.
It has been estimated that 400,000 tonneau covers were sold in their peak year. With truck sales down, there are less sold each year.
These covers are not free however some sites do provide free shipping when purchasing tonneau covers. Most of the nice covers cost between 200 and 400 dollars.
Tonneau covers are more durable and better compard to other truck covers in terms of quality. Read more at www.4wheelonline.com/Tonneau_Covers.1776 Many online users have rated Tonneau truck covers as high quality. Check for yourself on review sites such as amazon.com .