Lexus LX 600 Fuel Tank Capacity Litres – Complete Specs Rundown

I’ve always loved digging into the details that most people gloss over. So when I got my hands on the Lexus LX 600, one of the first things I checked was its fuel tank: how big is it in litres, what fuel it drinks, and how far it might realistically go.

In this article, I walk you through the LX 600 fuel tank capacity, what’s recommended by Lexus, real owner feedback, and a full specs and range rundown.

What is the actual Lexus LX 600 Fuel Tank Capacity in Litres?

Let’s start with the main takeaway: the Lexus LX 600 fuel tank capacity is 21.1 gallons. In litres, that converts to about 79.9 litres (1 gal ≈ 3.785 L). Some sources round to 80 L in summary specs.

Lexus itself recommends premium unleaded gasoline (91 AKI / 95 RON or higher) for the LX 600, though regular fuel may run in a pinch with some performance loss. (Always check your owner’s manual for your country.)

In forum threads and owner discussions, a few drivers have reported slightly lower fill volumes than spec — often because the tank’s design leaves a reserve cushion, or the refueling pump stops early. On a ClubLexus thread, some noted that when they top off, they can only add a few gallons, suggesting the real usable volume is a bit less than claimed.

Lexus LX 600 – Complete Fuel Tank and Specifications Table

How Big Is the Fuel Tank on a Lexus LX 600?

From my time with LX 600 specs and feedback, I can confidently say the official tank size is 21.1 gallons, which is about 79.9 litres. That’s fairly generous for a luxury full-size SUV. In everyday use, I noticed that when refueling, the pump often stops short of that mark, meaning usable capacity is slightly less.

That’s common with large European and Japanese SUVs — they leave a built-in buffer or margin so you don’t overfill.

From my perspective, this design helps prevent fuel inaccessibility when the vehicle is on an incline or after heavy use.

Also, because the LX 600 is heavy and powerful, it uses more fuel per mile than a sedan, so the larger tank helps extend its practical driving range. Given its weight (~5,600+ lbs) and its twin-turbo V6, the 80-litre class tank feels balanced — not excessive, but not stingy either.

How Big Is the Gas Tank on a Lexus LX?

Talking about earlier Lexus LX models (like LX 570 or older LX generations), their tanks ranged differently depending on generation and region. In those models, tank sizes commonly sat in the 24–26 gallon range (≈ 90–98 litres) in some markets.

But with the shift to LX 600, Lexus opted for a slightly smaller or more optimized tank size (~21.1 gal / ~80 L) for better packaging and perhaps weight balance.

If you ask me, the newer LX 600’s tank is still ample for its usage envelope. While older LXs may have had more margin, they often weighed more and had less efficient engines. In practice, an 80-litre tank in a modern, turbocharged SUV gives you enough range for highway runs without making the fuel system excessively heavy or costly.

What Is the Gas Mileage on a Lexus LX 600?

In my tests and from spec listings, the 2024 Lexus LX 600 achieves an EPA-rated 17 mpg city / 22 mpg highway / 19 mpg combined for its Luxury/standard trims (Edmunds). Real-world users, tracked via Fuelly, show an average of ~18.2 mpg over mixed driving in the U.S.

From my perspective driving it, results depend heavily on driving style and load. With light driving and highway cruising, I saw mpg closer to the highway spec. But when loaded or in city traffic, the rate drops. The blend of performance, weight, and power means you shouldn’t expect economy levels of a midsize — this is a luxury heavyweight that sips, not gulps, relative to older V8s.

How Many Miles per Gallon Does a 2025 LX 600 Get?

Though my focus was on the 2024 model, the 2025 LX 600 seems to carry over the same powertrain and specs. So I estimate the 2025 version will deliver 17 city / 22 highway / 19 combined mpg — just like 2024. Owners and spec pages for 2025 show no major change in fuel system or engine tuning.

I think, unless Lexus changes tuning or weight, the real-world mpg for 2025 will be very close to those numbers. If anything, slight improvements in aero or rolling resistance might inch up highway fuel economy a bit, but I wouldn’t count on dramatic changes.

Does the Lexus LX 600 Require Premium Gas?

Yes — from what I found, Lexus recommends premium unleaded gasoline (91 AKI / 95 RON or higher) for optimal performance. Using lower-octane fuel can lead to reduced performance, possible knocking, and potentially lower efficiency.

Many owner manuals and Lexus sources emphasize that premium fuel ensures the engine’s advanced turbocharging and timing systems work safely and as intended.

In my experience, running something lower than premium produces a perceptible drop in throttle response or hesitation under load. Being a flagship SUV with a turbocharged engine, the LX 600’s systems expect higher-octane fuel for best results. I’d never gamble with regular fuel, unless in an emergency, and even then only briefly.

Final Thoughts

After digging into the numbers, driving impressions, and owner feedback, I’m convinced the Lexus LX 600 fuel tank capacity is well chosen — about 21.1 gallons (≈ 79.9 litres) — giving you a solid balance of range and usable weight.

The recommended premium gasoline keeps the engine performing smoothly, and the mpg figures, while not spectacular, are competitive for its class.

From where I sit, the LX 600’s fuel system is not just a spec; it’s part of the package that makes the vehicle feel complete.

It gives you enough range to travel, flexibility for driving styles, and assurance that you’re in a thoughtfully engineered ride.