I have the Grand Highlander hybrid max limited and am averaging around 23 mpg for daily driving. The gas tank max capacity is supposed to be 17 gallons but I am only able to put in a max of 12.5 gallons once the low fuel light comes on. Is there a large reserve tank and do I have an extra 4.5 gallons of range left when the low fuel warning light comes on? Please let me know how many gallons you are able to put into your tank once the low fuel light comes on (I still had 19 miles of range left once the low fuel light came on). Thanks!
Fuel Tank capacity issue
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See this post: https://www.grandhighlanderforum.co.../fuel-tank-capacity-issue.121/?post_id=699&nested_view=1&sortby=oldest#post-699
Or this one: https://www.grandhighlanderforum.co...tank-capacity-issue.121/page-2?post_id=919&nested_view=1&sortby=oldest#post-919
One question I have is how they drained the gas? If I were more adventurous, I would run the car to near empty, disconnect the fuel line to drain it to see how much gas was left and then fill it back up. Then I'd be certain that the gas could actually go to the engine vs the fuel line not being at the bottom of the tank.
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Hi Christopher,
Welcome to the forum! You've raised some interesting points about the fuel capacity specifications. It's definitely frustrating when things aren't clear, especially with something as basic as fuel tank capacity.
Do you remember the specific TSB (Technical Service Bulletin) that was mentioned regarding the saddle-shaped tank? Have you noticed any patterns with your refueling? For example, is it consistently under the expected fill-up, or does it vary?
I ran the tank past 0 DTE today, but only about 2 additional miles. Even then, fill up was only 12.8 gallons going to the second handle click. The most I've put in was 12.9 gallons with 32 DTE, but that may have been a bit of an overfill based on the calculated vs displayed MPG.
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I too have a GHHL and have ran down to 25 mi only be allowed to pump around 12-13 gal and at one point the gas was overflowing. Not good won’t try that again.
Still getting around 450 a tank though. 33mpg.
Tank specs are definitely off!!
Still getting around 450 a tank though. 33mpg.
Tank specs are definitely off!!
I recently refilled w/ 1 mile range displayed - and it took just 14.1 gallons.
GHHL and we regularly hit the 32-36 mpg EPA estimates, even loaded with family of five, cargo box, and bike rack using hitch. Greatest hits include 222 highway miles @ 34.0 mpg, and 10.6 urban miles @ 42.5. Short trips in cold not as good though, I've seen mid/high 20's.
The two hybrids strike me as very different offers - one for mileage, the other for performance - with a very stark choice between them. I wonder if we'll see a TX 350h eventually.
GHHL and we regularly hit the 32-36 mpg EPA estimates, even loaded with family of five, cargo box, and bike rack using hitch. Greatest hits include 222 highway miles @ 34.0 mpg, and 10.6 urban miles @ 42.5. Short trips in cold not as good though, I've seen mid/high 20's.
The two hybrids strike me as very different offers - one for mileage, the other for performance - with a very stark choice between them. I wonder if we'll see a TX 350h eventually.
Drive vehicle till LOW FUEL WARNING light comes on while monitoring DTE mileage.
Fill vehicle after LFW light is on (still take about 13 gal).
DTE is a calculation based on mpg,fuel left and EV miles, its constantly being adjusted.
I expect LFW is activated by float position in tank, a better indication of remaining fuel.
I'm thinking the float/fuel pump in tank is not correct unit, sending wrong information.
Fill vehicle after LFW light is on (still take about 13 gal).
DTE is a calculation based on mpg,fuel left and EV miles, its constantly being adjusted.
I expect LFW is activated by float position in tank, a better indication of remaining fuel.
I'm thinking the float/fuel pump in tank is not correct unit, sending wrong information.
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Published 2024 Toyota Hybrid Grand Highlander (TGH) specifications, the TGH owner’s manual and dealer information provided indicated the vehicle has a 17.2-gallon fuel tank. However, the most fuel I can get in the tank is between 11 and 11.5 gallons. I've had the vehicle in to fix the defect on three occasions: 2023-11-27, 2024-3-11, & 2024-8-13 to no avail. On the second service, Toyota's technician said the tank had 16.8 gallons remaining when I picked it up, I had filled it the previous day and driven approximately 15 miles. Once the gauge showed near empty with only a few miles left of fuel, I filled the tank and was only able to get 11.4 gallons in the tank. There appears to be six gallons of fuel that I am carrying in the tank that the fuel system cannot access.
Welcome to the thread! When you say "filled the tank", do you mean stop at the first pump click? Second? Until gas is pouring on your feet?
You can see in my previous post a few before yours, I stop after the second click. Today, I think I underfilled the tank a bit since my calculated mpg was 40.7 vs. 37.5 on the display.
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Hi @garbutt.newton,
Have you had a chance to escalate this issue beyond the initial service department? Sometimes, speaking with a regional service manager or contacting Toyota customer service can lead to new insights.
I have GHHL, my low fuel light came on with 24 DTE.
I drove car 9 miles past 0 DTE and fuel guage showing nothing, parked it, restarted car and it's showing 9 DTE and little red at empty end of fuel guage.
I filled tank, with nozzle 1 click past auto shut off, took 14 gallons, had driven 494.6 miles, DTE now showing 552, showing average 36.7 MPG.
Nothing is consistant.
I drove car 9 miles past 0 DTE and fuel guage showing nothing, parked it, restarted car and it's showing 9 DTE and little red at empty end of fuel guage.
I filled tank, with nozzle 1 click past auto shut off, took 14 gallons, had driven 494.6 miles, DTE now showing 552, showing average 36.7 MPG.
Nothing is consistant.
In case you want a point of comparison, my gas XLE shows an average of 22.4 MPG since I purchased it last November, about 90% city driving. I also track with the Fuelly app and it shows slightly lower. For me this is an improvement over the Tacoma I traded in which averaged 16-17 MPG. Your 36.7 is excellent.
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Hello all, Same issue in my GH Hybrid Max Platinum. I took it to dealer and the service associate basically told me this is a common issue in Toyotas and that I can drive the vehicle 50 miles past when the "refuel" indicator comes on. I've been doing this and filling my tank and I consistently am able to put 15 gallons of gas in the vehicle, so there are still 2 gallons left in the tank. My belief is that the miles to empty is not correctly calculating. I've watch and for every mile I lose on MTE, I only drive about 0.6-0.7 miles. This is literally the only think I dislike about the car, but I've gotten used to resetting my trip A at each fill up and ignoring the gas gauge completely.
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Welcome @martin.stephanie2011 Is this the only issue you've had with your Grand Highlander?
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Have you noticed any patterns in the mileage discrepancies? For instance, does it get worse in certain conditions like city vs. highway driving?
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No, it's like that city or highway. I drive both.
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Yep, I love everything else about it!
Thanks, I agree with this completely. I've had a Hybrid Max Platinum since January '24. Very frustrating that for the first 6000 miles, refueling at DTE 20-40 allows only ~12 gals. When full DTE is 400, but it drops at a rate like martin.stephanie2011 mentioned, ~0.7 actual miles per 1 DTE mile. So we only go about 280 miles, and then we have felt compelled to refill due to DTE <10 - all it takes in is 12 gals. Today I finally ran it beyond "REFUEL", and it did absolutely fine for 53 miles. When I refilled, for the first time ever I got 14.5 gal in. I topped off x 1 click to 15.1 gals. Interestingly, after this fill and top off, the DTE is only 430 miles. So in conclusion - there is likely nothing wrong the tank size - it is probably a 17.9 gal tank as advertised. There is something very wrong with the DTE calculator/fuel level indicator. It says the car is empty when there are several (not just 1-2) gallons left. My guess is my vehicle (getting 26 mpg) will drive ~100 miles past "REFUEL." When it comes down to it, we are being sold a $60-70K vehicle with a faulty fuel gauge. That's absurd. But we like everything else about the vehicle. Just wanted some peace of mind around this fuel gauge issue.
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