Quote:
Originally Posted by Jeff M
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)
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I'd have to speculate and I don't like to do that.
GM may have already optimized the Avalanche as a 'notchback'.
With the exception of converting to a K-form fastback roof line,she may already be as low as she will go as a notchback.
There's just so little info in the public domain.
You're at Cd 0.363.
GMC got to Cd 0.315 in the early 90s for Bonneville.It's at the bottom
