The readout on my IS 250 shows 31 mpg driving around the city and 32 mpg on the highway. My actual hand calculated mileage is around 2 mpg less than the readout.

 

i dont thikn i have ever hit 30 mpg haha. but i average almost 21 mpg

 

Over the last 3 years, I average 22-23 mpg in my 350.

 

over the past 14 months, average is 20-21 for my 350.

 

I collected everyone's mileage in this thread and it looks like the 250 gets about 10-15% better than the 350. That's around $160/yr difference if you drive 12,000 miles/yr.

 

man... I get a average MPG of 19 in my 350

 

25 for me would be more but that damn exhaust just sounds sooooo good

 

Yup... the 350 is about 10% more money and 10% worse mileage... for about 50% more power. Helluva deal honestly.

 

Anywhere from 18 to 21 for my IS350. More than sufficient for me. Consistently get an average of 26 for long inter-city trips with 99% aggressive highway (interstate) driving. I'll often cruise at 90 MPH - not really a gas saving speed, and I still get around 26.

 

I just got back from Vegas last weekend and i averaged 27mpg at a cruising speed of 80mph... It would alternate between 26.9-27.0mpg .. Almost got 400miles on a full tank.. not bad at all...

 

I just got back from Vegas too, in 250 on the drive down going 80-100 got 30+ mpg, I think for the tank I got 33 mpg. Drive back closer to 28-29 because of traffic.

 

So that was you that flew past me going 100mph.. haahaa.. J/K

 

i'm getting 27-28 mix city and highway. Mostly highway with no traffic tho

 

May have been, I rolled by a CHP that was with a car that got in an accident going 100 and was like AWOEFJAOWIFJAWIOFJ but okay nothing happened haha


Car made it fine both ways and barely got rock chips, just lots of bugs. A few other 2IS flew by me too haha.

 

I've been getting about 350 on a full tank for the last 4 month.

Recently change my tires and got 400 miles.
Seems like the tires made big difference.