The BEST GX driving mode for Hwy driving on decent roads (1 Viewer)

[Emergencymed]

I’m still orienting to some of the features of my 2026 OT plus and decided to play around with the “custom” drive modes in settings.

On my drive to LA this morning (stopping at Lexus SB for a coffee and chat with their staff), I went through different permutations of the custom driving mode options (steering feel, suspension, power train, and air conditioning) to come up with the optimum selection for long drives.

Now up front disclosure:

1. I’m a driver - and so on hwy I’m always interested in the firmest most responsive steering.

2. Given the poor mileage on these vehicles and the longer distances being driven, I made mileage a priority in my selections. Keeping in mind that most of us don’t drive our GX / off road vehicles the same way we drive a 911.

3. When in the drivers seat, I tend to tolerate a firmer drive for better vehicle handling, so that also jaded my selections.

These aspects being considered my personal favorite selection set for long drives was “sports” for steering and suspension and” “eco” for power train, and air conditioning.

This was followed by sports for “steering,” comfort for “suspension,” and eco for the remaining toggles. (Especially when sitting in the front passenger seat .. ).

Curious to know how others feel. And if there are any Lexus engineers in the group - consider creating more than one “custom” choice in the select menu. (For example “: custom1 and custom2 for more than one customization option).

 

[incognito.gx]

hwy driving i mainly use Normal but around town I use Custom (Sport Steering, Sport Powertrain, Normal Suspension). I find ECO and Comfort unusable

 

[tougu]

I am also having this dilemma. I came from a pre-Google UI Volvo XC90 with air suspension where the changes were pretty dramatic. I could only drive that in Sport, everything else drove me nuts.

I have been playing a lot and now I find the opposite: I prefer Eco - I simply like the more chill throttle tip in and the idea that (maybe) it helps a teensy tiny bit with MPG, which has been horrible around town. And I find when I boot it I still get a good kick down and acceleration. So take it for what it is worth, but that is my $.02. And I'm still playing...

 

[Emergencymed]

So on my way back from LA - I put the vote to all car occupants (instead of the driver alone) including the two other passengers… and together everyone agreed on the best compromise (while keeping powertrain on eco- and thus performance at its low end) was:

Steering: sport
Suspension: comfort
With powertrain and ac to “gas saving default”

TBH - I do NOT know that ECO gives ANY significant gas saving advantage compared to “Normal” .. would be interesting if anyone has actually studied this by trying each mode for the same run and comparing exact mileage..

 

[GA Lexus]

Eco all the way. That is haw I had my LX for 88k miles, which gave a combined 17.6 mpg.
If I’m expecting a situation where some aggressive maneuvering may be required, I briefly select sport. Then back to eco afterwards.

 

[Finn GX]

So on my way back from LA - I put the vote to all car occupants (instead of the driver alone) including the two other passengers… and together everyone agreed on the best compromise (while keeping powertrain on eco- and thus performance at its low end) was:

Steering: sport
Suspension: comfort
With powertrain and ac to “gas saving default”

TBH - I do NOT know that ECO gives ANY significant gas saving advantage compared to “Normal” .. would be interesting if anyone has actually studied this by trying each mode for the same run and comparing exact mileage..

for my driving style & roads (mostly rural) I have not noticed a real difference in mpg from ECO to Normal. I've been through several tank fulls back and forth for each as a trial analysis. YMMV

 

[Emergencymed]

Did a deeper dive on the drive modes and unexpectedly found that not all trims have the full adjustment of suspension. I found this breakdown of the specific adjustments that take place in an AVS (Adaptive Variable Suspension) equipped vehicle: I.e. Luxury+, Overtrail, and Overtrail+ only.

• Sport S+ — Sport throttle, Sport suspension, Sport steering, Normal a/c
• Sport S — Sport throttle, Normal suspension, Normal steering, Normal a/c
• Normal — Normal throttle, Normal suspension, Normal steering, Normal a/c
• Comfort — Eco throttle, Comfort suspension, Normal steering, Normal a/c
• Eco — Eco throttle, Comfort suspension, Normal steering, Eco a/c
• Custom Mode – Pick your powertrain suspension, steering, and a/c settings

My current thought is Sport S/ S+ for around town driving, to minimize body roll. Eco, Normal, or Comfort off road. And Custom: Sport steering, comfort suspension, and eco power and a/c for long hauls without towing. From what other owners seem to report online “it’s all about a light foot on the gas” and Eco may help to the tune of 0.5 to 1 mpg off the top. Driving in Eco most of the time with speeds ranging from 65 - 80 - I’m seeing 16.7 - 17 consistently. Never more.. (nowhere close to the claimed 21 hwy). I’ve read that the GX gets its consistently best mileage at below 70 mph hwy for long hauls.

 

[GA Lexus]

I have ceramin tint on the inside of the windshild (with WPF outside). This may help reduce cabin heat and allow eco AC in the Georgia.
The OT+ side walls and adaptive susp seem to absorb the road imperfections well. Almost as well as the LX. And possibly better than the Lux.

 

[GeauX_550]

So on my way back from LA - I put the vote to all car occupants (instead of the driver alone) including the two other passengers… and together everyone agreed on the best compromise (while keeping powertrain on eco- and thus performance at its low end) was:

Steering: sport
Suspension: comfort
With powertrain and ac to “gas saving default”

TBH - I do NOT know that ECO gives ANY significant gas saving advantage compared to “Normal” .. would be interesting if anyone has actually studied this by trying each mode for the same run and comparing exact mileage..

GX550 Real World MPG a little insight, however, not exact science

 

[Emergencymed]

GeauX-500: Just in case someone doesn’t think to press the link that you attached::

“Tested full tanks on eco, comfort, normal, sport, and sport + until fuel light came on, all under roughly the same driving conditions/habits. Best was eco at ~330 miles, worst was sport + ~295. As a result I would say, "Life's too short not to drive in sport mode ” - GeauX-550

Very insightful message - the difference between Eco and sport mode is essentially 35 miles. Which is roughly 2 gallons of gas - which in Cali is about $12 per tank difference between Eco and Sport.

In my analysis - were I driving one of my Porsches I would not hesitate to burn that $12 in Sport mode. But on long hauls in the GX where I’m clipping along at between 65 and 75+… it just makes sense to stay in Eco mode and save $12 …

But I totally agree with the premise.. we paid a smidge under $100,000 for these vehicles.. we may as well enjoy them… for me that may not be in sport mode.. but rather it may be getting it out and getting it muddy and driving the vehicle for what it was made to do!

GeauX- thanks for the data and the wisdom!

 

[Psyberius]

Normal for highway use.
Custom setting is sport suspension, normal everything else if it’s particularly windy. Not a huge help as it doesn’t firm up/alter spring rates. But firming up the dampers helps a little.

 

[Angelitopstar27]

Normal for highway use.
Custom setting is sport suspension, normal everything else if it’s particularly windy. Not a huge help as it doesn’t firm up/alter spring rates. But firming up the dampers helps a little.

My fuel economy feedback is gonna be from Another country.
I am from Panama , central Americaa.
Here we have extremly low sppeed, long distances on bumper to bumoer traffic.
highways here which literraly are less than 10 have a maximun speed of 100kph (62 mph)
interstate routes have a speed of 80kph (50mph)
so the average driving speed of this beatst is verry low.
our measurements here are like the correct international ones.
kilometers, liters
kilometers per hour..
which makes it easier to calculate based on Japan measurments of fuel economy.
japan rates the gx550
city driving 5.6kms/ liter... 13mpg for you (usa people)
highway ( this test in a more real world are done at a different speed which is 80kph (50mph) not like your highways that are bewteen 70 to 85 mph ..
japan measured 9.8 kms/l which is 23mpg for you people.

I already did a fuel economy post a while ago but no one cared...
for my country
my usable tank when dial states 0kms left for trip is 65 liters of fuel ( 17 gals for you people)
that in turn should give me a 364 kms of driving range .. 226 miles of range for you people on city
my real world has been lower at around 5kms/l which is 11.7 mpg on city testing
that gives me a 334kms of city range or 207 miles per usable tank range
on interstate ets say
i should have a theorical driving of 637kms which is 395 miles per tank
that one i can say has been even better cause at 11.1 kms / liter or 26 mpg on my highway driving like i explained.
that gives me a 700 kms range or 440 miles per tank...

thats here in Panama
overtrail
265/70R18 toyo open country tires at 33psi cold pressures.
cheers

 

[Emergencymed]

My fuel economy feedback is gonna be from Another country.
I am from Panama , central Americaa.
Here we have extremly low sppeed, long distances on bumper to bumoer traffic.
highways here which literraly are less than 10 have a maximun speed of 100kph (62 mph)
interstate routes have a speed of 80kph (50mph)
so the average driving speed of this beatst is verry low.
our measurements here are like the correct international ones.
kilometers, liters
kilometers per hour..
which makes it easier to calculate based on Japan measurments of fuel economy.
japan rates the gx550
city driving 5.6kms/ liter... 13mpg for you (usa people)
highway ( this test in a more real world are done at a different speed which is 80kph (50mph) not like your highways that are bewteen 70 to 85 mph ..
japan measured 9.8 kms/l which is 23mpg for you people.

I already did a fuel economy post a while ago but no one cared...
for my country
my usable tank when dial states 0kms left for trip is 65 liters of fuel ( 17 gals for you people)
that in turn should give me a 364 kms of driving range .. 226 miles of range for you people on city
my real world has been lower at around 5kms/l which is 11.7 mpg on city testing
that gives me a 334kms of city range or 207 miles per usable tank range
on interstate ets say
i should have a theorical driving of 637kms which is 395 miles per tank
that one i can say has been even better cause at 11.1 kms / liter or 26 mpg on my highway driving like i explained.
that gives me a 700 kms range or 440 miles per tank...

thats here in Panama
overtrail
265/70R18 toyo open country tires at 33psi cold pressures.
cheers

Angelito it’s an unfortunate reality that none of us (wherever we are in the world) with even the most gentle throttle babying, on eco mode, are able to produce anything close to 21 mpg (hwy) as Lexus claims. And frankly the LC250 with its 4 banger hybrid is not far behind. Share with us some pics of your rig in tropical Panama on a fresh thread ..

 

[nonamex]

There was only one guy that achieved that claim and he bragged about it constantly. For the rest of us, the only way we get 21 MPG would be on a tow truck bed going downhill.

 

[Angelitopstar27]

Angelito it’s an unfortunate reality that none of us (wherever we are in the world) with even the most gentle throttle babying, on eco mode, are able to produce anything close to 21 mpg (hwy) as Lexus claims. And frankly the LC250 with its 4 banger hybrid is not far behind. Share with us some pics of your rig in tropical Panama on a fresh thread ..

I remember that dude. The kids would say he was “MPGMaxxing”

I did 2 test today. One longer than the other.
The last one was for almost an hour of mixed conditions.
It did in my conditions in Panama.
Average of 8.3 kms/L or 19.5 mpg.

This weekend I'll try to do a longer range testing for the overtrail.
Again remmeber my speeds are lower than yours in USA

 

[Emergencymed]

Angelito - Your mileage numbers are significantly higher than the rest of us around the globe … Wondering what the octane rating is for your gasoline ️? And it isn’t some variant engine .. My assumption is that Lexus doesn’t make this vehicle in a diesel (yet?)..

 

[Angelitopstar27]

Angelito - Your mileage numbers are significantly higher than the rest of us around the globe … Wondering what the octane rating is for your gasoline ️? And it isn’t some variant engine .. My assumption is that Lexus doesn’t make this vehicle in a diesel (yet?)..

Morning,
This is a 2026 Gx550 Overtrail
With the engine V35A-FTS
Same spec like you guys
With the same 265/70R18
33 psi cold tire pressuree
Oil is the same Ow-20
In that sense about fuel yeah
I run 95 octane fuel from Texaco (chevron subsidiary ?)
Techron fuel

 

[Emergencymed]

Bingo - That MUST be it - fuel at our local Costco where we gas up regularly is 91 octane. The higher 95 octane gas in your locale is likely giving you 19.5 to 21 mpg! Which is unattainable where we are!