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I couldnt browse the page but I have 5K miles on my IS350 with an average of 17mpg. I have never found estimates anywhere near what I get. I think the Sti was at 21 and I got 14.
Make sure you don't necessarily rely on the onboard gas mileage estimator. It isn't always dead on. I have had my car since late Nov. 06 and I use a handy software program on my Palm Pilot that calculates fuel efficiency (its a very simple calculation). I have 4,000 miles and my combined average is 24 mpg but remember, I am still in the break in period. Also, my highest mpg on one tank has been 26 mpg and the computer told me 28 mpg. I guess the computer will sync with my Palm's actual data after the break-in period.
Wow, now I feel really bad for my IS 250 AWD because I am getting 11mpg and I do about 50% city and 50% high way. On high way I won't go over 50 mph, and my mileage is at 250
My lifetime average in my 350 is 25.9. I can easily get 28mpg avg out of a tank if I control my right foot a bit. But as others have mentioned, it really depends entirely on what type of driving you do, and for the most part I'm going 55-75mpg on surface roads or 80mph on the highway, with few stops.