I miss my IS250 now. i used to get 28-33mpg.

 

According to the display I average 25 MPG can get 27 if Im easy on the throttle and 30 if I dive all highway.

 

Wow it looks like it varies from people to people. A lot of you say 21-23mpg while others get 25-28mpg. Such a big difference!

 

The problem isn't your car, its where you're driving lol (Manhattan).

 

I average 19.5 70% city and 30% highway. And I thought this was low. Looking here it seems about right. Just fyi, I noticed a 2-3 mpg gain after I switched to full synthetic.

 

30 mpg highway, cruising at 70 mph seems to be the sweet spot for me, any higher and it drops to 28-29 mpg. If I'm driving mostly city, I don't see better than 21-22 mpg.

 

I get 19-21MPG most of the time. (city only)

 

Yea u have nothing to complain about, I do 80% city 20% Highway in Chicago and I'm averaging 19-21mpg and I'm happy

 

I have not calculated my mileage manually yet but if I scroll through the display it shows average mileage to be about 14.5. The display for "this tankfull" usually shows 25-26. The rough calculations I have done in my head are very close to the 25-26 mpg. Am I supposed to reset anything for the display after filling or to start from scratch? Its a 2011 350c.

Chuck

 

Well my Avg is 23-25 but I'm pretty sure its around 20-21 as long as you're not getting below 15mpg you should be happy.

 

Yes, greatly varies from driver to driver. My wife and I have very similar commutes. I let her drive my 2006 IS350 sometime and only average 21-22 MPG (For the whole week). I typically get 25-26 MPG (maybe even 28 when I drive at speed limit of 65 mph).
I think this has a lot to do with driving styles as I am smoother on the accelerator and hardly use the brakes.

 

That is one factor but not a significant factor. The major factor is that CITY vs. HIGHWAY driving. The ones who getting good mileage do a lot more highway driving and the ones who get 19-21 are doing a lot more city driving.

When people report the number, please state CITY/HIGHWAY like 50/50 or something like that for accuracy. Simply saying I get 28 MPG or 13 MPG means nothing without knowing the context. Thanks.

 

Sorry but I think it is a significant factor I my case. The same car, very similar commutes of 30 city/70 hwy and distant of approximately 28 miles each way but my wife get less MPG because she usually accelerate fast from a stop and use the brakes more often (vs.me very smooth off the line and dont use the brakes as much).

 

I guess you can call 4 MPG difference significant (your wife get 21-22 while you get 25-26). I'm quite surprised your wife drives harder than you.

However, when it comes down to city vs. highway driving, it is a 9 MPG difference. (19-20 vs 28-29)

So in summary, fuel economy is affected by the two major factors:
1. City vs. highway (big factor)
2. Driving habit (hard and fast off the line vs. smooth, brake more vs. brake less...)

 

Yes, 4MPG is significant since the only different is the driving style. I could get a bit over 28 if i drive at speed limit.
Hahaha...the IS350 is my beater DD and no need to drive it hard. I leave that duty to my Z4M Coupe with 6 speeds and 8K Rev. Limit