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I have a sort of Ecoboost, Fiat's 0.875l Twinair 2cyl Turbo.
There's a two sided problem with all these small capacity turbos, boost=fun, but boost also means fuel enrichment (which comes on at very low boost- these cars can't really be driven off boost). Most people will struggle to get near the official NEDC figures, US EPA figures should be easier.
You can look at my fuel graph to see how much my economy improved as the engine wore in (still not fully run in IMO), this is why all the press cars were criticized for such poor economy.
I've managed an 80mpg run of about 14miles, starting and ending at the same point. At around 50mph on 'level' ground I can cruise at 80~100 MPG.
However, UFI is my weekend fun car, so I mix hypermiling with thrashing. My 48MPG 90 day is pretty good considering. We did a run with the Prius and UFI at the same time (switching drivers at half way), UFI beat the Prius by 7 MPG.
Given that UFI's the size of a Geo Metro (but a fair bit taller), and we've seen those hit 100mpg, while UFI's current tank sits at 58mpg -and is pretty close to the limit for this car you can decide if it's good or bad. With the base 4cyl, I expect I'd be knocking on 100mpg, but only with extensive EOC.
So I guess if you like EOC, stick to NA engines, if you don't like to have a bit of fun occasionally and can restrain yourself, these baby boosted models might be for you.
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