I've found the same to be true with my 2024 550h+, I'm able to fill about 12 gallons when light comes on, implying theres ~2 gallons in the tank

You can actually reference the owner manual to see what the low fuel warning light means (from 550h+ owner manual, indicates remaining fuel is approximately 1.8 gal or less.

Sounds like 350 and 500 have different issues and might have the wrong calibration like you mentioned. Toyota released a TSB so hopefully TX will get software update soon too.

My 2021 toyota rav4 prime/phev has about 4-5gallons left when low fuel warning light comes on... at 40mpg, thats like another 160-200 miles of range after light is lit.

 

How’s this, the low fuel light comes on in my 2nd gen Tundra when there’s 8 gallons left.


I had a ‘23 RAV4 prime and I believe when the DTE displayed “refuel”, there was around 2 gallons left. I actually ran the first tank from the dealership completely dry after 3,300 miles. After the engine died, I had full EV range so I kept driving and eventually drove to a gas station.

Still have a ‘23 RAV4 hybrid and when DTE displays “refuel” I believe there’s right around 2-2.2 gallons left.

 

This lines up as I had about 11 miles left on the DTE gauge when it indicated low fuel.

 

I was completely ready to pull the trigger on trading in my BMW for this Lexus 500H luxury all-wheel-drive
This thread has convinced me to pump the brakes on that idea. I do not want to be dealing with this issue. The lack of range, the fuel gauge issue and the paltry miles per gallon, sort of destroy all my incentive.
I guess thanks for helping me to dodge a bullet

 

I'm super happy with my new (to me) BMW. Looking back, the Lexus was a nice car but, the BMW is a better for for me.

 

I just fueled up my 3rd gen Prius. The low fuel light has been on for 100 miles and I drove additional 80 miles after the DTE reached 0. I made it to the pump on fumes. I learned how many miles I can drive past low fuel light and 0 DTE from Prius forum and from trial and error. I have to average at least 45mpg to go additional 100 miles once last gas bar starts flashing (I use trip B to keep track). Without doing this I would be refueling roughly every 400 miles instead of the 500+ miles I stretch it out to.

This fuel tank capacity issue is on every Lexus/Toyota I own(ed) dating back to 2008.

 

I was told by Lexus Engagement Center that that a fix is coming for the fuel tank issue December 2025. My fingers are crossed. Our TX 500h F Sport is a beautiful car and has many bonus points. The range is more than a major negative. Our fuel warning light comes on below 20 miles DTE. It should come appear with about 2 1/2 gallons left in the tank. That would be around 60 miles DTE. There are some things that need to be adjusted. The fuel issues/range and capacity need to be fixed. Hopefully, Lexus is aware of this forum and will attend to the issues that have been published.

 

Looks to be a feature not a bug. I wouldn't hold my breath for that fix.

 

If TX owners can get Toyota/Lexus to change their way of programming DTE, I applaud you!!

 

I promise that I am diligently working on the DTE issue as well as the fuel tank capacity issue. I constantly contact the Executive Lexus Engagement Center about this problem as well as the servicing dealership. I have extensive data from each fill up since May 2024. The data includes mileage, DTE before filling up, DTE after filling up, gallons to fill up, MPG and Avg. speed. The only thing that I have not recorded is the temperature outside. The next interesting component would be to take this information and check to see if the car's MPG closely matches the recorded information that I have. After reading a recent thread, this could be another issue that I have not explored. I hope any Lexus owner having a fuel range or fuel capacity issue becomes vocal. If the MPGs are not close to the 27/28 MPGs advertised on the sticker then that is another issue. The Lexus Engagement Center informed me that there should be a fuel fix for my in December 2025. There were no specific details about what the fix will be. In February of 2025, the car was diagnosed with a deformation in the fuel tank. "A new fuel tank is being redesigned for the deformation and will be available in the coming months." Hopefully, December is that coming month and Lexus will have a cure for these fuel issues. I am hopeful right now. We will see what evolves in December. It is my understanding that safety recall for the 12.3" display will not be available until December.

 

For what it's worth given my 550h+ is going to have yet a different fuel tank, here's what I've seen.

I have a 2025 550h+, built in July 2025. I was waiting for my low fuel indicator to come on. It did with the DTE saying 15 miles. I filled up and without trying to squeeze more in, it stopped filling at 12.7 gal. Someday, I might go ahead and drive it until it is out of fuel since I can have the battery to get me to a gas station. Of course, I don't know if there's something "bad" about truly running out of gas in these modern cars.

I have no idea if there is a capacity issue with the 550h+, or just where Lexus has set the 0 miles on the DTE. As it is, with 15 miles to go, that should be about half a gallon, so add that to my 12.7 gallons and you have 13.2. So, maybe the DTE = 0 miles, means there's another 1.3 gal (~40 miles left), or maybe not.

It's only because of this thread I've even considered the fuel tank size. During the 23 years I had my previous 2002 Tundra, I never tried to determine if the truck gas tank was really as large as it was supposed to be. I seldom took it on out of town trips. Obviously range is more of a real issue for some than others.

 

Hi, any updates on this issue? I am just off the phone with Lexus support for this very thing (after having my car in the dealership for a week with no solution). I also got a case number. I drive a ton and am at the gas station every other day due to never being able to put more than 12 gallons in..

 

All I know is I canceled my order because of this issue and I have gone with BMW X7
Maybe someday when Lexus figures out how to make a working gas gauge I will consider them again.

 

When you see refuel, do not panic!!
Drive to your favorite gas and fill up

@Stonebender has a solution that works for him/her.

Having X7 as well, the DTE is precisely accurate and actually fuel efficient if you have the B58(40i). We average around 500 miles in town and close to 600 miles per tank on highway.

 

I'm sure you'll enjoy the BMW X7 - its fun to drive. My service and reliability experience with BMW has been less than stellar, though, which is one reason we shifted to Lexus years ago.

The online notes about TX500h fuel capacity and range puzzle me quite a bit. I had some anxiety during my purchase of one in November 2025 (2026 model) for that reason (lots of bad posts on the issue). However, I've found no such problem(s) with mine. So if it exists, whatever the cause, it seems to have been corrected by Lexus.

So far each fill up has ranged from 16 to 16.8 gallons, filling the tank when both the low fuel light and range indicator (LOW FUEL, REFUEL NOW) indicators come on, which seems to happen within just a few miles of each other. There also seems to be at least a small reserve beyond this because the car runs perfectly down to that point, on hilly or flat terrain. Likewise, after fill, using the approach of one fast auto fill (then pause to let the fuel settle) followed by one or two SLOW auto fills (SAE tank rating standard recommended approach) I USUALLY put in 16 to 16.2 gallons. Last time around I put in a bit more out of curiosity (0.6 gallons) and there was STILL no gas visible in the filler neck or bad consequences.

In operation, I'm getting about 300-325 miles in the city, with many cold-start short trips, and about 25 MPG on the highway (car only has about 1,100 miles on it). But this seems to be improving a bit. I'm NOT a "lightfoot" and do not drive for efficiency but rather enjoy the responsiveness of the hybrid power train. Its quick! Overall, this gives me a practical range of 400+ miles on the highway.

No fuel filler door issues either (someone posted a TSB on this that seems to indicate Lexus addressed this issue as well.)

So far I'm pretty happy with my TX500H Performance Luxury. It's quick, agile, quiet and comfortable and has plenty of interior room for passengers and cargo (I recently hauled some 4x7 plywood sheets or a project with no problem). The range is just fine. And this is why I bought it, replacing my bulletproof 2nd generation 5.7L V8 Sequoia - which had LESS city range and about the same highway range - with a much larger (26.6 gallon) fuel tank. As a bonus, the cockpit is nearly identical in layout and use to my wife's 2023 RX350, and the rear wheel steering makes it pretty easy to park, so she's very comfortable driving the TX.

The only issue we had upon first use is that the steel reinforced F-Sport seat side bolsters are pretty stiff. But they've either loosened up or we've gotten used to them, because it's no longer an issue with either of us.

Enjoy your X7!