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The worst problem with the Echo is the revolutions per mile at highway speeds. Its close to 2550 at 60 MPH.
Although a cam may help some, it would probably be a lot better if you could get the revs per mile down to the 2000-2100 range.
I sold my 01 recently, but was looking at the transmissions interchangeability. There was a 6 speed with nice final drive gearing, but it was only available in Japan. Not sure how much you want to do to yours, but I would consider trying to find a taller differential ratio. Not sure if it would be cost effective, but if you could get the revs lower at high speed I think the results would probably be better.
My mileage average was close to 50, with some 53 MPG tanks this summer, but my situation is probably much more suited to higher mileage than average.
I tried engine off coasting for one tank and got 56 MPG. Too much work for the difference.
regards
Mech
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