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Aero Bed Shell (DIY Kammback style)
Folded Mirrors
Max Out Tire Pressure
Front Air Dam
Front Grill Block
Full Flat Bottom
Rear Fender Well Skirts (maybe)
Smooth Wheel Disks (maybe)
Scan Gauge
Quite the list, but wouldn't be needed just to hit 20 MPG highway.
For your stated vehicle and goals I would do:
***Good driving style.
*The custom bed shell
*Don't worry about folding the mirrors, just run standard (non towing) mirrors.
*Pick a relatively LRR street tire tread, preferably relatively narrow and tall (e.g. 235/85R16), but not max out the PSI. Run the PSI to get decent wear characteristics.
*Definitely front air dam.
*Don't do a massive grill block with an auto transmission. You better have accurate instrumentation (real gauges or OBD-ii readings, not the stock cluster) and a way to quickly remove the block if needed.
*Yes to flat bottom, but NOT under the exhaust.
*Fender Skirts/Smooth Disks- I would look to see if there is a relatively smooth factory wheel option and run that.
*Scanguage, Ultragauge, or similar. I ran an ultragauge on my 2005 Tacoma and loved it.
You should be well above 20MPG highway with that list. I don't do as much city driving as others, but for city driving I would suggest also looking at weight reduction and add double emphasis on driving style.
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