I like the new calculations.. It doesn't make me feel so bad about getting 18. something all the time..

 

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

 

I get about 23, but that's on the winter mix fuel (I guess)
Was getting 24-25 during the summer.

But then I drive slow most of the time.

 

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.

 

with 18k on my IS350 the car the lifetime avg is at 25.3. 70/30 Hwy for myself. Im really not an old man driver, just concious of pedal usage.