I've looked high and low for
 

I've looked high and low for an inexpensive tonneau cover for my truck bed to reduce aero drag, but the good ones cost more than I want to pay.

Truck caps have even more potential to reduce drag. I looked for aero truck caps, but they're all boxy and not at all tapered at the rear. Somebody could make a fortune making aero truck caps, if you ask me. I wonder why Leer and others don't make them?

Anyway, I bought a couple of pieces of plywood to make one for about 25 bucks. I'll post mileage soon.

hey my wheels have holes in
 

hey my wheels have holes in them, would it be logical to say if i were to tape up all these holes, that would reduce drag from inside the wheel itself?

https://img151.imageshack.us/img151/849/carsig1vp.jpg

so tape them all up and i have a "smooth cover" right?

making smooth wheel covers
 

making smooth wheel covers (or taping over the holes) will have a minimal positive impact.

is it worth it?

have you ever seen a picture of a bonneville salt flats car that *didn't* have smooth wheel covers?

Re: making smooth wheel covers
 

if i knew what a bonneville was hehe... now picking the tape part is hard, clear tape or duct tape? Making it not uglier than it already is the hardest part.

Damn fashion.

try saran wrap. It might
 

try saran wrap. It might just work.

Re: try saran wrap. It might
 

I still vote for pizza trays.

saran might work if you have
 

saran might work if you have wheel covers, but it looks like phil has alloys. pizza trays & careful drilling.

i was going to try aluminum foil for my wheel covers. but then i remembered i need the foil to make my hats.

I always thought some kind
 

I always thought some kind of boattail extension off the back of most cars would reduce the turbulent air flow behind the car (even for a fairly efficient car with a chopped off rear-end). Instead, you'd have a laminar flow off the trunk lid with a swirl trapped just behind the trunk that isn't interfered-with by the laminar flow (example with a <a href="https://people.clarkson.edu/~visser/research/drag/truck/">tractor-tailer</a>).

Instead of wheel covers, why
 

Instead of wheel covers, why not use wheel covers that are already streamlined, if appearance is your concern?

Check those of the Citroen Ax, Honda Insight, and Citroen Bx.