2015 gs350 awd bought second hand and its always been about a 1/4 tank off. low gas light comes on at around 20 miles left.

 

You have posted to the incorrect forum. The correct forum for your GS is here:

https://www.clublexus.com/forums/gs-...3-present-237/

Lou

 

Mine is the same. Every Toyota I've had has been off about the same. I usually go about 50 miles on a full tank before the gauge hits the full line and I get an a low fuel warning at an 1/8th of a tank.

 

On my 2016 GS350 the low fuel warning comes on at 20 miles range left BUT that range isn't what it appears to be in my opinion. On my previous cars the low fuel came on when the tank was lower - say about 2 gallons roughly.

They seem to be conservative on this car - my guess is there's more like 3 gallons +/- left. There's been one occasion where I went ten miles past 0 (so -10) and the tank still had I think roughly a gallon in it if I remember correctly.

PS - I wouldn't recommend doing this though...since I didn't quite know this car I was stressing a bit.

 

Based on the reported fuel tank capacity of 17.5 gallons and how much I put in after the fuel light comes on my estimate is that there is at least 1.5 gallons left and up to 2 gallons for an approximate range of at least 40 miles when the low fuel warning comes on.

 

My light comes on with 20 miles left, but the gas gauge is at about an eighth of a tank, not a quarter. Your gauge definitely seems off.

 

My gauge is definitely below a 1/4 when the light comes on but I don't know that I'd say it's at 1/8th. I just looked and the time I went -10 past on the range the car took 16.114 gallons. With the tank holding 17.5 and my usual mileage (mid 16s) that would mean I still had roughly another 23 miles (although I'd never want to push it that close).

 

My low fuel indicator also comes on at about 1/8 mark with 20 miles left. However when I refill, the tank usually takes 14.5 gallons.

 

Pretty much normal on a Toyota/Lexus product. My low fuel light comes on at 27 miles on both of my GS and the UX.

 

Low fuel should come on at 19 miles. The tank has a reserve of ~2 gallons so the fuel guage will be incorrect