Jump to content


Recommended Posts

Hello everyone, first time posting on this forum. 
I recently purchased a 2024 RX500F sport for my wife and have a question for the embers on this forum.  I understand that the vehicle has a 17.2 gallon fuel tank. I recently had a chance to notice that the low fuel indicator only came on at approximately 17 miles remaining range ( instead of 50).  I went to fill it up and could only put 12.8 gallons of fuel in it after letting click 4-5 times. I had previously brought this up to the dealership who could not give me an answer ( I thought a fuel sender calibration might be off).  BTW, the mpg indicator is reading approximately 19-20 more or less with about 1,300 miles on the vehicle.  I 

Link to comment
Share on other sites

Quote

The 2024 RX500 F-sport has a fuel tank capacity of 17.2 gallons123. When your display indicates that there is only 17 miles worth of fuel remaining, it doesn’t necessarily mean that your tank is completely empty. Most vehicles have a fuel reserve when the fuel gauge reads empty, to prevent the vehicle from running out of fuel and to protect the engine. This reserve can typically range from 1 to 3 gallons.

So, if you’re only able to put 12.8 gallons of fuel into the tank, it’s likely because there was still some fuel in the tank. The remaining 4.4 gallons (17.2 total capacity - 12.8 gallons you added) would be a combination of this reserve and the fuel left when your car indicated 17 miles remaining. This is a common feature in many vehicles to give drivers a buffer to reach a gas station after the fuel warning light comes on.

Please note that it’s generally not a good practice to frequently run your vehicle close to or on this reserve fuel, as it can cause the fuel pump to overheat and wear prematurely. The fuel pump relies on fuel for cooling and lubrication. So, it’s usually recommended to refill the tank when it’s about 1/4 full.

 

  • Thanks 1
Link to comment
Share on other sites

Get used to it...a typical amount of refuel ability IS about 12.5 gallons on the 17 gallon tank.

 

Gets talked about a LOT. 🤔

 

Personal experience: 

When filled, the DTE (Distance to empty) says ~ 410 miles. But the last fuel-gauge indicator "bar" on the gauge goes away at ~360 - 370 miles. When we fill at that point, same as you, the car only takes ~12.5 gallons.

 

++++++++++

 

Have never read an 'official' technical reason for the big reserve. Some have said that the extra fuel enables the hybrid system to run?

 

Quote
"2.6 gallons is for the low fuel light as a usable reserve (Page 519 of the manual).
Another 2.6 gallons that unusable/kept to prevent you from running below the amount to run the hybrid system on normal inclines. (Page 78 of the manual.)
17.2 - 2.6 - 2.6 = 12 gallons for the ‘E’ indication.

 

 

Link to comment
Share on other sites

2024 spec sheet states over 400 miles city and over 460 highway yet after filling the tank with 12 gallons or less the DTE shows 350 miles, false advertising or

deception?

Link to comment
Share on other sites

On 2/3/2024 at 9:43 PM, RX400h said:

 

I guess that the issue still stands that either the miles to empty range indicator is reading incorrectly ( overly pessimistic about range left to empty) when I theoretically  have at least 4 -4.5 gallons left in the tank, or  something ( an obstruction in the neck perhaps) is not letting me actually physically  fill the tank to it’s full capacity.  I have a Hellcat powered Trackhawk that forces me to rotate the butt of the fuel nozzle to a 1:00 O’clock position to add the last 4-5 gallons in the tank on occasion.  
In my former business life, I owned a pretty large operation of auto parts warehouses and would have annual sales of $2 -3 million in fuel pump category ( many OEM pumps fuel senders failed on domestic vehicles in large part due to the introduction of ethanol fuels in the early part of the century, so I am familiar with bad fuel senders.  
Finally, I never let my cars run to the fuel empty light lights up ( this is my wife’s car) but, it should give warning at a minimum of 40-50 miles based on her current 20 MPG.  I just happened to be driving it that morning. 

Link to comment
Share on other sites

Before there were electric read outs, the gauge showed empty when there was still at least 15% of capacity left. It is NOT deception, then or now, it is done that way on purpose so the general motoring public, most of whom are not very well versed in how vehicles work, don't run out of fuel. More than 80% would never twig to the fact they only take 12 or 13 gallons on empty because most have no idea what their actual tank capacity is. Ask 20 guys how to tell from the dash which side the fuel filler is on, might be 2 that can answer that.

Link to comment
Share on other sites

With our TX h, the reserve volume, fuel remaining, plus refill amount should equal 17.2 gallon time the 27 mpg should equal an DTE of 460 miles. Last fill up i only got 6.8 gallons before auto shut off. Squeezing handle multiple times hit another 0.6 gallons. Fuel gauge read 3 bars out of 4. No matter how much I refill the DTE never says 460 miles til empty  as car and driver or motor tend state in their Articles.  

Link to comment
Share on other sites

Why then do they print on their window sticker 3.7 gallons per 100 mikes car and driver using Lexus specs state 460 plus snd motor trend stated 460 plus. If these gallons are unusable, correct specs sheets and do not deceive customers. I filled up with 88 miles on DTE able to put 9.6 gallons got 3 bars on fuel guage. Snd new DTE of 340. 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



×
×
  • Create New...

Forums


News


Membership