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I would LOVE to ecomod your truck.
First off, I would keep the brush guard, but turn the center into an air dam. Basically a large flat area, and although it won't help Cd to have a big flat space [there], I would love to see if the wind flowing around would be more fuel efficient [than flowing into the engine bay]. Might not, might work- but your city cooling capacity should be fine- just keep Temps up on the SCii.
Second would be a boat tail. Easy to make, be it tacky like mine or more complex like others. Redneck recently has worked out a good one on his Metro (I believe it's a Metro). Since your truck has the sweetest rear hatch setup ever, it might be difficult to keep it usable while on there.
Third, I would keep your running boards and use them to build side skirts off of.
Fourth, I would walk underneath your truck (kidding, it's not that tall...) and do the full belly pan. Polycarbonate (election signs), used fish scale style.
Fifth would be flat wheel covers.
Sixth would be rear wheel skirts.
Seventh would be cutting off those mirrors and doing video.
Eighth would be skinnier tires. I imagine by time I did everything else, they'd be needed.
Sorry to rant my fantasy with your truck, but since you have four cars it seems like you are already using what's most appropriate for the job- and you have jobs requiring an Excursion. I am glad you are doing an SGii for the Excursion, but look at an UG (UltraGauge) for your Focus. The SGii is much better for testing, while the UG is better for monitoring a particular setup.
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