Are we giving false hope or are you only showing the low data? Is there nothing to support the other side? There seems (imho) to be a larger amount of people whom report an increase. There also seems to be a lot of people whom have this gripe initially, then their thread fades away within a few weeks (tanks of gas).
I'm not saying that there will be a definitive massive increase, and a lot has to do with driving habits/routes. Quite a few people are reporting mid to low 20's in straight-up city-only driving. Quite a few people are reporting high 20's/low 30's with mixed driving. Quite a few people are posting mid/high 30's and even low 40's with mostly highway driving.
I don't buy in to the '1000 mile break-in'. If that were true, we would have some seriously high-strength metals in our bores. What I do buy in to is that it takes the PCM a while to 'learn' our styles and habits. That, and our GDI engines are very touchy and respond quite drastically to small changes.
I don't go on Fuelly, what does the majority of the data represent?