Saw this on FB. Surprised it doesn't apply to the 2026 models as ours is a bit conservative also and goes to zero when there's still quite a bit left in the tank...

EDIT: I hate how FB likes to put their own link, didn't notice on my phone, poster below has the direct link.

 

How about not posting the FB link: https://static.oemdtc.com/NHTSA-PDFs...32485-0001.pdf

 

Regarding the TSB NOT referring to the 2026 TX500h ...

I think this 2026 TSB fuel gauge/warning light/range prediction update was already done on the 2026 TX500h models. I took delivery of my 2026 model year TX500h FSPL in November 2025 and have routinely put in 16-16.8 gallons when range indicated is ZERO and the low fuel light is ON ("REFUEL NOW"). I deliberately "ran it down" multiple times to see how the car behaved. It never had a problem, even on hills with low fuel.

The TX500h fuel tank is rated at 17.2 usable gallons by the SAE standard measuring method, which includes TWO topping-off stages after first pump "click off" (fast fill/slow fill/slow fill). So I believe the reserve on mine is only about 1.2 to 0.4 gallons (7-30 miles depending on driving) which seems pretty reasonable. On long highway trips over fairly even terrain I can achieve 400 miles in most cases (mountains being the strong exceptions) - which is acceptable - though I'm conservative on regular trips and usually like to refuel early - by 320-350 miles - with significant range still showing.

Bottom line to ME is - don't be afraid to "top up" the fuel tank - its how ALL cars fuel tank capacity seems to be rated - and some need the owner to go slow and top up more than others. My Gen II Toyota Sequoia and Ford Expedition were two cars that REALLY needed this - though my 2010 and 2023 RX350's also benefit but to a lesser degree. NONE of my cars has ever had a problem with me doing this. But it requires a little patience and finesses at fill-up time. I do NOT let the tank "spill over".

Note also that first pump "click-off" is highly variable and controlled by a non-precision mechanism that's affected by many factors, including manufacturing variance, temperature, etc. So don't expect every pump to fill the tank to the same level every time on first click off. I have to chuckle when I see Youtube videos rating the MPG readings on a cars dash by the fill method - after ONE fill. It really requires averaging over MANY fills to figure the calibration out precisely AND accurately. It turns out my TX500h MPG dashboard estimate is very close.

 

Has anyone had the L-SB-0010-26 performed? Has it improved the fuel capacity and driving range for the car? If so, how much improvement have you seen in fuel capacity and mileage? Thank you in advance for any input. We have put up with poor fuel range and capacity on our 2024 Lexus TX 500h F Sport. Lexus has kicked the can down the road acting like a wonderful fix was coming soon. It has been 2 years and I have yet to see this miraculous solution.

 

It's not a "miraculous solution". Just a gas guage/indicator recalibration to reduce hidden reserve. Not really a big deal. And if you never top-up, or run the range down to or close to zero, you'll NEVER see the full tank capacity and range. Other than calibration and the way you and I fill up our cars, I don't think there's much difference.

I suspect (but can't be sure) the large hidden reserve in earlier TX's may trace back to around 2020, when Toyota was criticized for insufficient reserve - leaving some people stranded when they pushed the limits of range too far. A buddy of mine had this issue with his Highlander (empty REALLY meant empty) and his was updated by TSB to "fix" the issue. Perhaps they went overboard in correcting this in future cars.

Whatever the reason, I suggest you get the TSB update, don't be afraid to top off your tank per the SAE standard method (look it up) and perhaps try running the car down from full to "Refuel Now" indicated to see how much it REALLY holds, before reserve. I did. The answer I got was 16-16.8 gallons. And I NEVER ran out of gas or had any warning lights/drivability issues, etc. Your car, presumably a TX500h, is not likely to be any different.

This is far better than driving a car you really despise because its gas guage is too conservative.

 

This might be it. Just afraid to run it too low as Lexus is recently having recalls being done on fuel pumps overheating and getting damaged on cars with the 2UR-GSE V8 like my IS500 from running the tank too low. CCN also rails against topping off the tank too much as it can damage the EVAP canister, but I'll try to 2 click method next time.

 

Sure thing. It's always good to be cautious - which is why I characterize the fuel gauge, range and capacity of every single car I've had before trusting it on a long trip, including what "Full", "3/4", "1/2", "1/4" and "0" REALLY means (amount of usable gallons in tank). And beware older/classic cars with "sticky" fuel gauges. I've had a couple of those, too. The usual culprit has been sensor damage due to alcohol in the gas or MTBEs, though a simple gunked-up float from old gas can do it too.

Never had an overheated fuel pump or charcoal cannister/drivability problem in my (many) cars, running and refueling them as I do. And it would be pretty silly if Toyota/Lexus allowed their cars to be seriously and permanently damaged by the topping off REQUIRED to completely fill their car's gas tanks to the specified usable capacity as arrived at by an SAE method that REQUIRES topping off. And any DECENT engineer who wanted to keep their job would also protect the car from a complete spillover - which WILL inevitably happen many times over many sales and many years - its a VERY predictable and common operator error - not good for the environment nor safe to do.

Regarding the fuel pump recalls on the following models:

• 2015–2022 Lexus RC (including performance F variants)
• 2016–2020 Lexus GS
• 2022 Lexus IS

These (~9,000) cars were recalled due to DEFECTIVE fuel pumps (improper impeller material that swells and deforms from fuel exposure - and heat makes it WORSE), not owner abuse. If you have a car that is prone to this (and there are not many affected), by all means bring it in before it stalls out due to fuel pump failure on a highway run (maximum flow rate) on a hot day. Regardless, its NEVER a good idea to let a fuel injected engine/fuel system run completely dry. But you should not be in danger of that when simply running down to "Refuel Now" (0 miles range) as there is obviously a reserve below that point - as long as the fuel monitoring system is doing its job. And from my own tests on my own 2026 TX500h - it seems to be.

 

I get the recalibration... but they really screwed up with the filler design. I even after two 'clicks', I can get another 2 gallons into the tank. That's not topping off, that's a bad fuel tank filler design IMO.

 

Pretty much every large vehicle I've had, with a long gas tank and lots of baffles, hs been like that. Not really a problem once ypu get to know your car.