[hat_man]

OK so it probably is a dumb question. Maybe cab spoiler isn't the right term. I was thinking of a "duck tail" type thing that extends the cab roofline rearward and downward about 4*-7*. Much more and I think the air flow would separate wouldn't it?

The picture I was talking about is the one that has the "baseline" pickup at the top and a bar graph for each subsequent truck. The last one has a full aerocap I think. It doesn't show much difference in the half and full tonneau alone but when paired with a "duck tail" the half cover is much more efficient. I was just wondering if the same held true if you paired a full cover with a "duck tail" as it wasn't shown in the chart. Maybe a smarter guy could draw the conclusion by I can't.

I do know that my cheap cover isn't working out very well. It doesn't like the sun very much and the 10mm coroplast is warping badly. I am going to try and "re-engineer" this idea with some better more rigid (read pricier) material. If there is a big difference in a half cover, rather than a full cover, when paired with a "duck tail" then it would save me some $$$ but I would have to give up a secure bed. If the difference is only minimal then I'll spend the extra $$$ to try and get the best ratio of form and function.

Thanks