Simply out of Curiosity I wanted to know what has been the highest MPG any of you have reached on your Lexus GS350's 3rd gen?
I was cruising at over 70mph when I reached about 29.7mpg which has been the highest on my 2009 GS.
I took a picture when I hit 20,000 miles on the vehicle and the MPG was 29.1
-The car is up for sale in NY

 

From ATL to Cincinnati in 1 tank...this also includes about 200 miles in the mountains in the high 80s. It says 77 because this was taken at 10 oclock at night

 

Maybe my car is still new.
2011 AWD with <$5K miles and I'm sitting at 21.7MPG. 75% highway 25% city. I have no idea how you guys achieve such high MPG if I were to drive like a human being.

 

My GS 460 burning premium regularly got 22.5/gal with about the same ratio of highway (commuting) and city (around the neighborhood and stop/go errands.

If I just drove around the neighborhood, it would be more like 14 mi/gal. Strictly highway at 80mph was 26 mi/gal......

 

32.2 mpg r/t from Phoenix to Tucson.

 

I'm doing about 24 MPG on all highway driving.

 

I did not reach much at the beginning. This was short after a re fueling and a reset. My current MPG (still with that same tank of gas) is 19.7. I never used to pass 15mpg in the city. Im surprised with this one.

 

I think driving to Vegas I had high 20's low 30"s. Averaging 75-80mph.

 

Road trips on a GS are Heaven

 

Best I've gotten was 33mpg going home 90% highway 10% city. This is running on 87 octane.

Regularly on long distance travels I usually get 31mpg (150 miles highway) and when running about 50% city 50% highway I get around 28mpg. All running on 87 octane as well.

Also it seems as though ideal MPH range for best MPG for me is around 45-60MPH. Any higher than 60MPH my MPG starts to decrease probably due to wind resistance.

 

best i managed was i believe 31mpg on a 2 hour trip home. 95% highway with cruise set to 80mph

 

08 GS350 18" wheels 245 wide tires (stock) and now 255 wide same sidewalls.

I can get consistant 30+ highway at 75-85 avg mph.
I have done this on trips from Phoenix to Washinton DC and multiple western road trips up to Canada and Washington/Oregon areas.

This is great MPG for a 300 HP not light at all luxoliner!!!!!!

 

Surprising so many people have reached these high mpg's as well. Im running on stock everything on the car. I average around 23-24 on highway and 15 or so city. This might be because I use the shell v-power gas. I know it gives more power, but im thinking it burnes faster.

 

My 430 gets 14-15 in city and 23-28 on highway....but its too much fun at high speeds. The rush I get from going 70-120 in a few seconds is to much to resist, when the road permits. Few blasts like that and I am in a 22-24 Mpg zone on the highway. Otherwise 25-28 is possible, if you drive like a....

I owned a 73 Lincoln Mark IV witha 7.5 liter V8. 5mpg in city, 8-9 on highway at best. Needless to say I only did 3000 miles in one year, mostly to car shows and just cruising around having a good time.

 

With a 450h, hwy trips aren't much better then the 350. I avg about 28 but I've gotten 34 multiple times.
problem is, you really have to have a lead foot to keep those electric motors on and bring the MPG up. But then you get a ticket :-)

I've seen 38 while doing 90. All motors cranking but covering twice the distance the V6 could accomplish on its own. I think they should re tune the software