I am in that survey....one of the few getting 41-43 mpg. Someone, maybe many, are wondering how it can be done.
Since we live in NM, and do some town driving but mostly highway...it makes sense to me. Also, the dryness here and the high altitude (7500 ft) seem to be a huge factor...even though I have to climb high mountains to get home each time.
And also interesting to note - we burn only 86 Octane out here for regular gas. Our Fit runs perfectly on that. We have 2200 mi on our Fit.
I am convinced that we will get 45 mpg on a trip, without A/C and not carrying a kayak or two....but likely in the Fall of the year. The only mod we have made is that we are running at 45 psi, and enjoying it.