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I have been investigating a different camshaft that reportedly helps fuel economy in metros. I'll probably order one soon.
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It makes a noticeable difference in low-end torque. I added an XFi camshaft (OEM fuel economy cam similar to 3tech's economy version) to my car. Though I didn't try to measure the change in fuel consumption (too difficult to get an accurate A-B-A comparison).
http://ecomodder.com/forum/showthrea...leted-102.html
In combination with switching to the tallest possible final drive (for reduced highway cruising RPM) they made for a good combination.
http://ecomodder.com/forum/showthrea...-gain-107.html
But my driving environment is very different from yours: I never take the freeway. Always secondary roads, so I'm rarely above 55 mph.