Originally Posted by maormaor

Hi All,

I just bought a 2023 lexus RX350H recently. Manual says it has a 17.2-gallon fuel tank. So far I have refilled the tank twice (with ~20 miles left each time before the refill) but each time it only took ~12 gallons. For each ~12 gallon I could drive 380-400 miles. I am just curious why the gas tank only holds 12 gallons for my car whereas it should hold 17?

Anyone has a clue?

Thanks.

Originally Posted by Seulbee77

I had the same problem! I didn’t want to only refuel at 12 gallons every time. I took it to the dealer with about 20 miles left and told them I want to be able to drive the 17 gallons the spec states. They refueled the car and of course it stopped at 11.5 gallons. Then the manager kept pumping while the gas pump kept stopping, forcing extra in. It finally overflowed at 15.5 gallons! They said there is couple gallons after fuel shows empty, so there is the total 17 gallons. I now fill my gas until it stops at around 12 gallons and then keep pumping it additional 2 gallons so I don’t have to refuel as often. I drive at least 500 miles a week driving my kids all over town for their activity on local roads. My best record is 620 miles at 40mpg when dealer filled it to 15.5 gallons. Next best is 582 miles with 14 gallons, yielding 41.5mpg. This is my first hybrid and I’m noticing driving style will impact that mpg significantly and have been driving gently to get best mileage.

Originally Posted by jahnjva

Seulbee77,
You are going to ruin your evap canister if you keep forcing in fuel and then it's going to cost you $$$$. 12 gallons is the norm for the RX 350. It's a Lexus glitch but they refuse to acknowledge it. Put the 12 gallons in and stop when the pump clicks off. They should be charged with false advertising.(619 miles Total Range 17.2 x 36mpg). The dealer was an idiot to overfill the car, he should know better.

Originally Posted by jahnjva

Filled up 350h today. It took 14.5 gallons on 1st pump click off. I had driven for a while after the light went on . Usually I put around 12-13 gallons in when the light goes on. I drove 495 miles so 34.1mpg. Car had calculated 35.9mpg. I think cold weather plus wife likes to idle to keep warm dropped the average. I usually get 36+mpg. So 17.2 - 14.5= 2.7 gallons left in the tank. I wonder how many more miles I could have gone before I ran out of gas? I had a 1.25gallon container as a backup but didn't use it. I'm not sure if 1.25gal would have worked if I had driven farther and the car dropped below 2.6 gallons and I tried restarting the car. If you read the note below it says that if the car runs out of fuel, you should add at least 2.6 gallons to make the light go out. Other wise the hybrid system may not start. Will the car keep running till the 2.7gallons are used up? Will it just not restart the hybrid system if it still has gas in the tank but below a certain thresh hold? (2.6gal)

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.)

Originally Posted by DavidTK

After waiting for 6 weeks, I finally got my Iridium 2024 rx 350H. Love the car but was concerned about if I would have the same problem with the gas gauge and unfortunately I do. My gas light came on with 23 DTE. The last fuel marker disappeared after the "refuel" warning showed. This was my first time refueling and I asked my sales person do they top off the fuel when they sale the car and she said yes. When I filled it up, it only took 14 gallons. I know that the 37MPG is an estimate and was done under perfect conditions. (drive at 55, no heat or air, flat road etc). I'm thinking that if there is 2.7 gallons left when the gas light comes on, then that's about at least 80 miles that I can still use. But that scares me. I only got 380 on the tank. Since it's my first tank, I knew I wasn't going to get optimal mileage. I'm already averaging 33 MPG with premium gas (the dealer puts in regular). But I hope this improves. Would be a very sad after spending $69K for the Hybrid and can only get to use 13 gallons per tank.

Originally Posted by Tacoshawn

An update.

At 12 miles DTE it alerts on the center display that only 12 miles are remaining.

Before the alert the DTE counted down 1 mile for every mile traveled.

After the alert the DTE count down slowed dramatically which was unexpected. I didn’t reset a trip odometer because I didn’t expect the change in behavior. My estimate is it took another ~25 miles to get DTE to 0. Next time I’ll reset a trip odometer at the alert.

So, after much more driving that I planned I got DTE to 0.

After zero I continued driving and the DTE range of 0 was replaced by ‘Refuel’.

I then filled completely at Costco with 13.4 gallons. So, almost 4 gallons of tank capacity remaining @ zero range left. Extremely conservative.

Originally Posted by Tacoshawn

An update.

At 12 miles DTE it alerts on the center display that only 12 miles are remaining.

Before the alert the DTE counted down 1 mile for every mile traveled.

After the alert the DTE count down slowed dramatically which was unexpected. I didn’t reset a trip odometer because I didn’t expect the change in behavior. My estimate is it took another ~25 miles to get DTE to 0. Next time I’ll reset a trip odometer at the alert.

So, after much more driving that I planned I got DTE to 0.

After zero I continued driving and the DTE range of 0 was replaced by ‘Refuel’.

I then filled completely at Costco with 13.4 gallons. So, almost 4 gallons of tank capacity remaining @ zero range left. Extremely conservative.

Originally Posted by EMTLEX

Well here is an odd variation on the comments relating to Distance to empty... I put the gas nozzle on slow fill auto shutoff. DTE start mileage was 22. Filled the tank until nozzle tripped off and then squeezed another few squirts in totally 13 gallons. Distance to empty now reads 425. I then drove about 6 miles and let the vehicle sit for 90 minutes. I went to another gas station very close by and based on some comments here... I tried to see how much more I could add, still using slow fill speed. I could barely squeeze in one more gallon. BUT...THE DISTANCE TO EMPTY DID NOT INCREMENT PAST THE 425 DTE MARK!!! I would have expected it to increment something near another 27 miles. Didn't happen.

For those saying "deal with it" I would disagree. This is like saying if you bought the expensive sound system but couldn't get anything more than level 2 sound out of it... just deal with it. I think they are just waiting until the user satisfaction hits some kind of pain point. This is an engineering fail. This will cause people on longer trips to start looking for gas stations in remote areas when they don't need to. Thanks for listening....

Originally Posted by raytseng

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.


​​​​​​

Originally Posted by daryll40

Very impressive that any vehicle that weight can squeeze that many miles out of a gallon of gas