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When I had put a tonneau cover on my other pick-up (Blek-blek),
I noticed a better mileage and a higher top speed.
With the fuel consumption of my Elcamino, a tonneau cover will be ever welcome...
But the bed shape under the rear window poses problem.

Some searchs on the web gave me these results:

Hard cover:
 
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A hard type covering the bed edges.
 Same model open.
A hard cover fitted into the bed.
Same model open.
 
The hard cover transforms the bed into a vast sedan trunk .
With the trunk lid open, the bed is not more useable as stock.
No question now to load a fridge or a large wardrobe!
I could think that the pickup is no more a pickup...
Soft cover:
 
CLICK 2 C CLICK 2 C CLICK 2 C CLICK 2 C
A model braced by laths.
A beautiful one found on the web.
Another one.
Detail under the rear window.
 
These soft covers, by covering the bed's edges, hide the chromed trims which do the elegance of the Elcamino bed. The hard cover fitted inside the bed respects this point.CLICK 2 C
 

Conclusion: I must think about a soft cover fitted inside the bed like this simulation:

August the 8th 2001:    Building a tonneau cover
 
The soft cover fitted inside the bed is possible only
if I find a way to attach it inside the bed.
I think about a system like the "Tupperware" boxes.
After successful tries with plastic tube used for radiant floor heating,
I try it out with a 5'X7' tarpaulin bought in a gardening store (3$):
 
CLICK 2 C
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Tarpaulin edge is a heating tube which (dia=10/12mm)
fits easily into a bigger heating tube (dia=13/16mm) 
split open. This tube is fixed around the bed.
 
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The cover is easy to take off and put on.
Detail under the rear window.
Final result.
Not so bad, isn't it?

  
Even at 120Km/h, the cover doesn't move, it just blows a little behind the rear window.
There is no air movement that could grab it.
The try is good, when I will feel up to it, I will redo the cover with better quality tarpaulin.
 
 

August the 8th 2001:  Update
Good surprise! My mileage increases from 11.9mpg to 12.7mpg .
Tonneaus are good.

Novembre the 12th 2001: Update
 
CLICK 2 CCLICK 2 CNow it's Automn and the cover has just been tested under a big pourring rain.
The concern is the accumulation of rain water:
The weight of this water could then strip off the cover.
Results just after this deluge: 
Water doesn't stay  and the cover doesn't fall.
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