Quote:
Originally Posted by aerohead
The 1/2 tonneau was good for 5% mpg on the T-100,D-100,Chevy Silverado,'93 Toyota truck,and a F-150 4 by 4.With a "blister" which is like the back portion of the aeroshell mounted atop the 1/2-tonneau,mpg was 8% better on the T-100.If you combine it with the first 20-24-inches of the aeroshell(Ford Motor Co. calls this a "sail panel"),you can pick up a combined 18% mpg improvement,and still have easy access to your gear or cargo.
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I know this is an old post, but I've been debating about how my vehicle fits into the above comment. I have an 09 Avalanche which has a factory sail panel, on the top it extends 8" on a slightly downward angle and at the bottom it is 30" with a larger inward taper. Also the factory tonneau removes in panels, there are 3 total (but the bed is only 5.25ft long). While I know I need to fill the holes in the sail panel in (I used plexiglass there on my older Avalanche), do you think this would be adequate or should the top be extended out at least the 20-24" that you mentioned to maximize the effect? (keeping in mind that it is a very short bed)