This thread is a "how to" on what NOT to do if you want to save gas.
Link:
Rear Spoiler on Pick Up Truck - Experiment - Pelican Parts Technical BBS
This modification will cost you gas, although it will add some tracking stability on the highway which I like very much.
The crazy version:
Rear Spoiler on Pick Up Truck - Experiment - Pelican Parts Technical BBS
How it is today:
Rear Spoiler on Pick Up Truck - Experiment - Page 2 - Pelican Parts Technical BBS
The flip down hinge I installed two years ago has since rusted to a set angle. Should anyone do this, use stainless steel piano hinge from a boat supply store.
The shorter Gurney flap will cost you about 1 mpg on the highway, but I like the added stability at highway speeds so it's staying.
In Michigan we get black ice, and after a night of that pick-up trucks can be found in the trenches off the highway and in the grassy/snowy divided highway area. For this reason I'm keeping my Gurney Flap, it's a safety feature at this point. And like most safety features it costs a little in gas mileage.
EDIT: The full photo album on this truck link.................
S10 4x4 Pick Up pictures by kach22i - Photobucket
Sample:
Yes, I also own and experiment on my hovercraft.