You might want to play the video below before you add more gas once the pump shuts off. This one is by Scotty Kilmer. The car care nut also has one. You risk an expensive repair just to get a few extra miles.

 

Being able to add 4-5 additional gallons is more than a “few more miles”

Your link did not work but I can bet I know what it says.

 

I agree 100% but how do you know when extra gallon 4 or 5 puts you in the danger zone for evap canister damage? There is definite glitch in the Lexus/Toyota metering system which they refuse to acknowledge/fix. Until they do fix it, I will stop filling when the pump clicks off. I still get 4 to 500 miles on a tank.

 

https://www.youtube.com/shorts/FPS398IZVwU


see if that like works ?

 

I just ordered my 350h this weekend. Interested in seeing if this issue continues by the time I take delivery. My first hybrid here. I'm generally a 1/4 of a tank person, but I'd be willing try carrying some extra gasoline around once (in a proper container) to see how many miles it will take to get to empty. with my current 2018 350, I let the gas automatically pump and when it stops, the gauge is just above full. Learned from many folks years ago to never try to top off.

 

Very bad idea to run a hybrid completely out of gas. This was from a video below but would apply to the RX hybrid as well. If you run out of gas in a hybrid, at least shut it off as soon as you realize it. If you lucky, the traction battery will have enough juice to start the engine.



I've been driving a 2019 Prius Prime for the last 4 years, and will take delivery of a Rav4 Prime next week. This may be one of the most valuable YouTube videos I will watch all year. Another thing I want to point out to all Toyota Hybrid owners: the starter motor for the gas engine in your car is the MG1 motor/generator, which is powered from the traction battery, NOT the 12 volt accessory battery. If your traction battery ever gets so low that it can't crank the engine over, there is no way that you can recharge it at home. All Toyota dealers have a "rescue" charger in the service department, which plugs into the inverter, or into the DC power cable that runs between the inverter and the traction battery. This system carries potentially lethal voltage and it's why only dealerships, or Toyota-specializing repair shops, are likely to have this equipment. If you have to have a Toyota Hybrid towed in to a repair shop because the traction battery is too depleted to crank over the ICE, a session on the rescue charger is likely to cost you at least $400. So DON'T run your Toyota HSD out of gas! The possible consequences can cost you hundreds of dollars, even if no actual damage has been done. These two guys were very lucky that they had an OBD-II scanner at hand, that allowed them to clear the ECM trouble codes, or they would likely have had to call for a tow truck. NOTE: If you have a Prius Prime or Rav4 Prime, a dead traction battery is less of a problem, because you can plug in and recharge it at home without having to resort to a $400 visit to a repair shop for a "rescue recharge".


From the manual:
Running out of fuel
When the vehicle has run out of fuel and the
hybrid system cannot be started, refuel the
vehicle with at least enough gasoline to
make the low fuel level warning light
(P.519) go off. If there is only a small
amount of fuel, the hybrid system may not
be able to start. (The standard amount of
fuel is about 2.6 gal. [9.8 L, 2.2 Imp. gal.],
when the vehicle is on a level surface. This
value may vary when the vehicle is on a
slope. Add extra fuel when the vehicle is
inclined.)

 

Dude on the left looks like Orlando Bloom....

 

I think people are jumping on you unnecessarily because there are 2 different issues combined in this thread that affect your range.
One is the fuel reserve and low fuel light being a bit high and where 0 is for the user display and range.
Two is the refuelling cutoff issue which is the main issue you are focused on.

I think you certainly can have issues of refilling is shutting off prematurely, and people maybe jump on and attack you for topping off because they aren't having the issue.
It's hard to quickly tell the difference unless you are doing some rough calculations.
I would say though that the float should be accurate. If it clicks off and you go in and the needle is above F, then it's full.
​​​​​5 gallons is a lot, if its 5gallons low, the needle should be well under F and an early cutoff. If you were able to fit 5more gallons in with the needle on F, something is terribly wrong like your fuel tank might have a defect or dent.

Given the active egr system this is a fussier tank than older or non hybrid cars, so I don't think you are crazy,.but also this is probably something wrong with just your car or your refueling technique and others don't have it.
The tips I can give for you to try to narrow it down if it is a refuelling technique issue is to try:

-a different station or pump to see if it's a specific pump that always causing you this behavior.
-not using the pump lever and manually pump a little slower than max speed, and with the nozzle firmly in and down, tilting nozzle tip up( in other words following how to use a gas pump by the book)

-Giving some extra time after pressing the fueldoor button before opening the lid and cap E.g. at least 30seconds after you pressed the button. Press button, work pump kiosk, then open tank.


​​​​​​

 

Hi all!
I just got my new 2023 rx500h last week and filled up my tank for the first time today and I’m a little concerned. I had ~ 50 miles to empty and I thought the tank was 17.2 gallons. When I filled up it stopped at 10.7 gallons, and then when I turned on my car to see how many miles I have it says 398 miles. I thought it was supposed to be ~ 468. Has anyone else had this happen to them? I’m worried something is wrong…

 

I had a similar problem today and I was so confused and worried something is wrong. I have had my rx500h for about a week and just filled it up for the first time. I had about 50miles remaining and then when I filled it up it only went to 10.7 gallons (I thought it was supposed to have 17.2..?) and then when I turned it on it said 398 (I thought it was supposed to have closer to 460…). Anyone else have this problem? It’s making me nervous …

 

this is a known issue .

why there is almost 4 gallons unaccounted for in our tanks is a mystery and has not been answered by lexus yet

 

It seems to me that the only mystery is the size of the reserve. On one occasion I got down to zero miles left, with nowhere near to fill up, and so I had to keep on driving. I drove another 60 miles before I was able to fill up, and who knows how much further I could have gone. Had it been 75-80 miles, that would have easilly accounted for 3-4 gallons.

Maybe I'm misunderstanding the problem though. In any event, I usually just fill up when it says I have 20-30 miles or so left and, as long as the mpg remains where I expect it, which it does, then I don't give it another thought.

 

If you wait till the pump gun kicks off, you will leave well below full. I can’t even fill my RX350 tank at anything above a trickle speed or the pump kick off over and over. This is a problem and when I asked the service people, they told me they had heard this complaint over and over. I will ask them to look for any type of restriction between the filler and tank at the 10K but have no faith in them finding it.

 

There are two options really - something special about your car, or something special about your ( or in general, Florida ? ) petrol stations. To eliminate this last option - try to fill up in New Jersey one day - you will not be allowed to fill up yourself, and I never had problems here

 

First, I am glad I do not live in Jersey. If I did let them gas me up, I would leave 7-9 gallons short. I have tried multiple Amoco stations and the result is the same.