ROSCOGX470

My computer states 15.4 AVG and I drive 90% city. I think real time mileage is closer to 14.5 city.

not sure

all figures on 87 ocatane;

originally, ~18.5 mpg hand-calculated with 70% highway (on-board computer read around 2mpg too high)

after install of Thule Hull-a-port Pro kayak carrier (adds a couple of inches height to a maybe 16" cross section of the roof rack), ~17.5mpg

during 2000 mile roadtrip recently with Thule Summit cargo carrier, kayak...16.5 with no wind...14.5mpg in strong cross/headwind limiting speeds to 60-65mph

desertjunk

I have recently taken a nice drive in my '06 GX470, went over two mountain passes, through a few towns for 20 miles, on I-5 for 3 hours, 290 miles total, came away getting 18.7. I drive a little fast, about 5 or 10 over depending on traffic and my mood. So about 75-80 on highway.
I consistently use 91 octane gas, I can get 93 octane, I might try that before my next trip and see what I get. I am happy if its close to 19, if I hit 20 I would be thrilled!
I have noticed that my on board computer is always about 2 MPG's less than actual, so I am always using the calculator on my phone. First time I checked the computer is scared me!!
As a side note my wife was tailing me in the new '07 LX470 we bought in Bend Oregon, she got 16.2, I thought that was a good number!

SkeetShoot

my 04 consistently gets between 14.4 and 15.1 I use 87 Octane all the time as I don't need to put premium in it.

chiph9

You can see my mileage history at Fuelly:

http://www.fuelly.com/car/lexus/gx470/2004/chiph/266955

Chip H.