4RX Mileage Thread
10th Gear
Joined: Jan 2024
Posts: 13
Likes: 1
From: Canada
I have a 2020 and mileage really depends on driving habits. On highway I get about 24 mph but in city with stop and go it drops to about 17 mpg.....sorry, I am in US so we use the goofy units. So your mileage is definitely low....about 14 mpg.
Dirty Air filter and/or MAF sensor, and old spark plugs could all also contribute. With 136k on the engine (km or miles) the plugs may be due.
Dirty Air filter and/or MAF sensor, and old spark plugs could all also contribute. With 136k on the engine (km or miles) the plugs may be due.
I’ve also seen guys on here recommend lexuspartsdirect.ca but shipping seems pretty high
Thanks!
10th Gear
Joined: Jan 2024
Posts: 13
Likes: 1
From: Canada
16.5 l/100kms is a bit low for city driving...depends on how bad the stop and go, idle time, temperature, etc.
16.5 is 17 mpg (imp)
I never found eco got better gas milage, just horrible acceleration.
I get a bit better (22 RX350) in the city (14 avg) and substantially better on the highway (9.8 avg) Almost the same as my 6.2l 4x4 pick up truck!
Like Quantum501 says, check Filters, plugs, etc.
16.5 is 17 mpg (imp)
I never found eco got better gas milage, just horrible acceleration.
I get a bit better (22 RX350) in the city (14 avg) and substantially better on the highway (9.8 avg) Almost the same as my 6.2l 4x4 pick up truck!
Like Quantum501 says, check Filters, plugs, etc.
yes it does seem to shift weird/poor acceleration.
i will try off eco, it has been a bit cold here but not too crazy. I usually only idle for a few minutes
I will look into above thanks again!
Rookie
Joined: Aug 2023
Posts: 44
Likes: 17
From: CO
I can't believe the mileage some of you guys get! I thought I drove like a total grandpa and I'm maxing out around 27 with an average closer to 25.
My theory is that the car isn't very efficient at 70-80mph (my local highway speed) but quite efficient at the 45-55mph range.
My theory is that the car isn't very efficient at 70-80mph (my local highway speed) but quite efficient at the 45-55mph range.
Advanced
Joined: Apr 2017
Posts: 701
Likes: 166
From: NSW
I can't believe the mileage some of you guys get! I thought I drove like a total grandpa and I'm maxing out around 27 with an average closer to 25.
My theory is that the car isn't very efficient at 70-80mph (my local highway speed) but quite efficient at the 45-55mph range.
My theory is that the car isn't very efficient at 70-80mph (my local highway speed) but quite efficient at the 45-55mph range.
I regularly get 19 mpg driving in metro areas and 29 mpg on highways, that's at 70 mph
Driver
Joined: Oct 2020
Posts: 93
Likes: 30
From: OH
The three biggest things that impact MPG are
1. The route you take
If traveling in the city, do not expect more than 22 MPG because of stop and go traffic.
2. How hard you are on the gas pedal
When your pressing more on the gas pedal, your engine needs more gas to produce more acceleration. Just apply enough to drive steady and go with flow of traffic. Avoid overtaking.
3. The wind direction
Ever rode a bike facing in direction of the wind? It's the same for a car. If traveling in the direction of the wind(10mph+) at freeway speeds, do not expect to get more than 23mpg. Engine needs more gas to produce the same speed with a headwind. You can see direction of the wind in the weather app in the infotainment panel.
With a tailwind, you can get 30+ MPG at 60MPG freeway speed. There is less wind in the evening and night time than during the day,
With the above 3 tips, I'm consistently able to average 25-28mpg on my 2017 RX 250 (with AC ON). My highest was 31MPG on a 8mile trip going to work with a tailwind.
I've found things like tire pressure (unless its below 25PSI), hyper-miling (very unsafe) and the grade of gas you use doesn't matter that much.
1. The route you take
If traveling in the city, do not expect more than 22 MPG because of stop and go traffic.
2. How hard you are on the gas pedal
When your pressing more on the gas pedal, your engine needs more gas to produce more acceleration. Just apply enough to drive steady and go with flow of traffic. Avoid overtaking.
3. The wind direction
Ever rode a bike facing in direction of the wind? It's the same for a car. If traveling in the direction of the wind(10mph+) at freeway speeds, do not expect to get more than 23mpg. Engine needs more gas to produce the same speed with a headwind. You can see direction of the wind in the weather app in the infotainment panel.
With a tailwind, you can get 30+ MPG at 60MPG freeway speed. There is less wind in the evening and night time than during the day,
With the above 3 tips, I'm consistently able to average 25-28mpg on my 2017 RX 250 (with AC ON). My highest was 31MPG on a 8mile trip going to work with a tailwind.
I've found things like tire pressure (unless its below 25PSI), hyper-miling (very unsafe) and the grade of gas you use doesn't matter that much.
Last edited by Lexus4rx; Jul 8, 2024 at 10:41 PM.
Driver School Candidate
Joined: Aug 2024
Posts: 23
Likes: 3
24.5 mpg on mine.
Was checking to see what you really get on the highway in gas mileage. It states 28 mpg. I have a BMW that states 28 mpg but in highway driving I normally get about 30 mpg w/o ac running. This is by measuring mpg after filling tank. The computer read out would sometimes state 32 mpg but when measured on fill up it was sometimes 2 mpg off. Mercedes s class I had stated 26 mpg highway and I got 28 to 30 mpg all the time.
Wondering if RX exceeds mpg rating as well?
Wondering if RX exceeds mpg rating as well?
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5th Gear
Joined: Oct 2022
Posts: 5
Likes: 2
From: FL
Anyone noticing drastic differences in gasoline quality?
Since the pandemic, I've been getting wildly divergent mileage numbers from 2 separate vehicles: 1) 2017 Lexus Rx, 2) 2008 Chevy Cobalt.
I noticed it first in the Cobalt and thought IT might be the issue. Then I noticed the same issue in the RX.
With exactly the same driving habits in exactly the same place, I'm getting a range of 20-33% less-than-normal-mileage in both cars when the problem happens. The best mileage I usually get (see exception below) is the normal mileage I was getting prior to noticing this issue.
It makes me wonder if all the supply chain issues during the pandemic had some effect on the gas refining process or delivery process.
I've tried to stick to big-brand name gas, like Mobil. And I've also started getting higher-octane gas just to see if it had an effect (it did-10-20% better mileage, when it works).
But recently I got Mobil Supreme in the cobalt, and my overall mileage dropped to 21 mpg. My prior fillup, with Race Trac's highest grade, boosted the Cobalt's mileage to the highest I've ever seen in that car - 36 mpg.
I know 2 vehicles is a small sample size, but at this point I'm convinced that SOMETHING is going on with gas.
Any input appreciated.
I noticed it first in the Cobalt and thought IT might be the issue. Then I noticed the same issue in the RX.
With exactly the same driving habits in exactly the same place, I'm getting a range of 20-33% less-than-normal-mileage in both cars when the problem happens. The best mileage I usually get (see exception below) is the normal mileage I was getting prior to noticing this issue.
It makes me wonder if all the supply chain issues during the pandemic had some effect on the gas refining process or delivery process.
I've tried to stick to big-brand name gas, like Mobil. And I've also started getting higher-octane gas just to see if it had an effect (it did-10-20% better mileage, when it works).
But recently I got Mobil Supreme in the cobalt, and my overall mileage dropped to 21 mpg. My prior fillup, with Race Trac's highest grade, boosted the Cobalt's mileage to the highest I've ever seen in that car - 36 mpg.
I know 2 vehicles is a small sample size, but at this point I'm convinced that SOMETHING is going on with gas.
Any input appreciated.
5th Gear
Joined: Oct 2022
Posts: 5
Likes: 2
From: FL
And I was correct -- after manually checking MPG by comparing amount of gas used vs. miles travelled, the RX is OVERSTATING mileage by 13%.
So, that 33 mpg I reported back in Oct 22, is actually more like 28.7. Still not terrible...but disappointing to discover.
Last edited by UrXMyXOurX; Nov 1, 2024 at 10:17 AM.
Driver
Joined: Oct 2020
Posts: 93
Likes: 30
From: OH
I still think the way computer generates is accurate.
when you do manually fill-ups, there is still residual gas left which you are not taking into account.
when I fill up my tank, sometime the miles range will say 313, or 326, or even 358. so when you fill up your tank, you actually might not be filling it all the way up. It has to do with how the gas nozzle detects gas vapor in your tank.
when you do manually fill-ups, there is still residual gas left which you are not taking into account.
when I fill up my tank, sometime the miles range will say 313, or 326, or even 358. so when you fill up your tank, you actually might not be filling it all the way up. It has to do with how the gas nozzle detects gas vapor in your tank.
Last edited by Lexus4rx; Nov 4, 2024 at 06:19 AM.
5th Gear
Joined: Oct 2022
Posts: 5
Likes: 2
From: FL
Hmmm...seems like simple math: miles traveled / gas used (assuming the tripmeter/odometer is accurate). The difference in fillup amount can't be THAT different each fillup 
.
Though if it is, it should average out over time. So, I should probably have a larger sample size than 1.
.Though if it is, it should average out over time. So, I should probably have a larger sample size than 1.
Racer
Joined: Nov 2017
Posts: 1,939
Likes: 581
From: New York
Hmmm...seems like simple math: miles traveled / gas used (assuming the tripmeter/odometer is accurate). The difference in fillup amount can't be THAT different each fillup .
Though if it is, it should average out over time. So, I should probably have a larger sample size than 1.
.Though if it is, it should average out over time. So, I should probably have a larger sample size than 1.
Advanced
Joined: Feb 2020
Posts: 747
Likes: 459
From: WV
I still think the way computer generates is accurate.
when you do manually fill-ups, there is still residual gas left which you are not taking into account.
when I fill up my tank, sometime the miles range will say 313, or 326, or even 358. so when you fill up your tank, you actually might not be filling it all the way up. It has to do with how the gas nozzle detects gas vapor in your tank.
when you do manually fill-ups, there is still residual gas left which you are not taking into account.
when I fill up my tank, sometime the miles range will say 313, or 326, or even 358. so when you fill up your tank, you actually might not be filling it all the way up. It has to do with how the gas nozzle detects gas vapor in your tank.
I did a long term (25 fill-ups) mileage test that I've previously posted. During that I noticed the indicated mileage could differ from the manually calculated mileage by +/- 1.1 mpg for a single fill-up. Over the life of the test, though, indicated and calculated mileage was within .1 mpg.
