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Hello,
As you might have noticed (in my signature) my wife is now driving a Scion xD -- and the very first tankful has equaled my 90 day average. The car is ~310 pounds heavier, and has a 1.8 liter engine, a 4-speed automatic, and a slightly worse 0.32 Cd (vs 0.31 or my xA), and the EPA Combined estimate is lower at 29mpg -- and all I did was pump up the tires a little (~37psi vs the 32 recommended) and seal (most) of the hood joint to the top of the grill....
Now at 55mpg, the engine only turns at ~2,050RPM, so that may be most of how it does it. I hope to do similar front end aero mods -- esp covering the pockets where the fog light would go, and the upper grill is only for show -- and this car could be hitting 50mpg real soon.
The factory MPG gauge is a little optimistic, BTW -- it said we did 44mpg, while we actually did ~42mpg. But for the first tankful, I am quite impressed!
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