Hi Mike & welcome to EM,
I'm glad you enjoyed reading about my aero mods, and I hope you got something from it -- you're welcome!
In a practical sense, the xA is a low as I want it to be: the chin spoiler just clears (most) curbs, and I have to drive it in the snow, and go over speed bumps, driveway ramps, etc.
I think the biggest gains can be had by improving the aero on the underside of the car -- and by swapping out the final drive. Which on my car is 4.31:1 -- what is it on your car? The same engine and transmission in almost every other model that Toyota uses it have a 3.56:1 final drive. I would LOVE to drop my revs by 17.5%! This would (probably) help the FE a lot...
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