My NSX gets around 27mpg with mostly highway driving. Lowest MPG is probably 23-24 MPG on a mostly city tank. Keep in mind this is premium gas. When working on the car, its apparent that the NSX is of superior build quality. The NSX is all aluminum alloy and no power steering which is probably why such an aggressively tuned engine can get decent gas mileage. It is a lot longer and wider than the civic although it probably weighs about the same. For those of you unfamiliar with the NSX, here is a good intro to the car:
http://video.google.com/videoplay?do...08022187&q=nsx
I have been fixing up the civic, trying to make it look more modern and new (NOT ricey). It looks pretty decent, but my fiancee still gets onto me as I am a doctor and driving the NSX seems more in line with my professional status than driving the civic. Oh well, the MPG's put a grin on my face anyhow. I just averaged 53.8mpg on a highway stretch!