I've been averaging 33mpg in my 04 xB (with a best-tank of 34.5 where I never cracked 50mph or shifted over 2k). Other than claims on forums as to such, I've noticed, are just that: claims on forums. It's always 'oh, I shift at 3k and have my tires at 29psi. what's your problem?'
I don't doubt that 40mpg is possible, I just don't think it's that easy, especially with a stock vehicle. 40mpg could probably be done with low speeds, extreme hypermiling and aggressive aeromods.
@IndyIan: the Echo is, mechanically, identical to the xA and xB, but smaller, lighter, has a lower cD, and was available without power steering. It's vastly more efficient than an xB. The xA is much closer to the Echo in terms of configuration and dimensions, and efficiency follows as such.
Granted, I still can't complain about 33mpg on average-- in the Subaru Impreza I had previously, I was really happy with 25mpg in town and 30 on the highway.
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