Originally Posted by 0011

Hi

New 05 LS430 owner here trying to find the real answer to the actual capacity of my 2005 Lexus LS 430 fuel tank.

There are lots of postings trying to address this question but no “real” answer that I could find.

Here is what I did: I drove my car as I normally do until the low fuel light came on. The trip odometer reading was 369 miles.

I had planned for this and had a half gallon of gas in the the trunk to use for the experiment. I would then drive the neighborhood waiting to run out of fuel by the car engine missing.

The car mileage was 418 when that happened at which time I put the half gallon of gas I had in the trunk in the gas tank.

The car started right up and I drove 3 miles to the nearest service station when the odometer reading 421 miles and one half gallon of gas in the tank.

I began filling the car wondering what the final number of gallons would be. 20, 21,22, 23 gallons when the automatic stop fueling stopped. I was then able to add an additional .9 gallons being careful not spill any while adding as much as the car will hold.

So, low fuel light came on at 369 miles. Drove an additional 49 miles when I ran out of gas. Added one half gallon of gas with 418 miles on the odometer. Drove 3 miles to the gas station. Put 23.9 gallons of gas in the tank plus the .5 gallons
added, for a total fuel tank capacity of 24.4 gallons of gas.