I would appreciate seeing statistics by area. Manually, I have noticed that Outbacks in California seem to get much better gas mileage then we do on the East Coast. I have PZEV on my vehicle, like what I understand is required in California, so I would like to see if the difference in gas mileage can be attributed somehow to region.
Lambanlaa is near me, so I can say that compared to Cali, esp Southern Cali, we have seasons here and they do not. Winters are usually in the 20s-30s, and in July and August it can reach the high 90s with high humidity.
I'd also like this feature, because climate differences between where I live (Northeeast Ohio) and places like the south and west have a huge effect on my mileage. I'd like to know how I'm doing compared to others with the same model, but it's not fair for me to compare myself to someone in the south who doesn't have to deal with below-freezing temperatures, snow and slush.
How about letting Fuelly members identify their climate from a map like this? http://www.blueplanetbiomes.org/climate.htm
Then everyone from a similar climate could be grouped together for comparison. I would love to know what gas mileage other northerners are getting, as mine swings wildly across seasons.