Fuel Tank options for Land Cruiser 250/ GX550

ultane · Mar 19, 2026

erhall55 said:
On a whole other tangent, it seems that the Toyota coders could figure out an option that allows you to invoke an economy mode rather than always in max power mode. After all, aren't most hybrids designed toward fuel economy? The fuel economy on my LC 250 was a bit of a shocker and continues to be the bain of ownership when considering the tank capacity.

Miss Daisy has three modes available, ECO, normal, Sport. There are threads on these modes on this forum.

Fuel economy on the standard tires is mainly determined by the operator’s driving style in this ‘parallel’ hybrid. This hybrid design is best suited for added low end torque, not necessarily fuel economy (like a Prius). The Car Care Nut has a video on the pulse and glide technique. When traveling, my tank average (calculated at each fill up) is almost always above 27 mpg, and has been as high as 30+ mpg. On fillup, yesterday, Miss Daisy’s DTE was 419 miles. I almost always use ethanol free 93 octane fuel, lesser octane when the 93 octane cannot be found. Pushing a brick through the air is costly above 60 mph… Very costly above 70 mph. Stiff head winds will also kill fuel economy.

Roonie · Mar 19, 2026

agjake01 said:
Looking forward to hearing how the fuel transfer and MTE display works out with the FK 12Gal from @shwazz714. Have a feeling FK is about to get several more orders. Maybe a forum discount?

Yes I am waiting as well to see, but will only buy a system that doesn't relocate spare tire. I have the swing out tire on my older landcruiser and its a pain to get into the rear cargo area everytime. No thanks on the tire swing out. Hoping the 12 gallon add on is the ticket.

I am also Seattle area wondering where to get installed..... Mule, Nomad?

agjake01 · Mar 19, 2026

Roonie said:
Yes I am waiting as well to see, but will only buy a system that doesn't relocate spare tire. I have the swing out tire on my older landcruiser and its a pain to get into the rear cargo area everytime. No thanks on the tire swing out. Hoping the 12 gallon add on is the ticket.

I am also Seattle area wondering where to get installed..... Mule, Nomad?

Haven’t heard back from Mule yet but maybe we can get a group install discount, their labor rate is $175 an hour. Nomad didn’t feel comfortable with the install and referred me to Auburn Car Repair & Offroad who said they could definitely do it, but were unsure of how long it would take. They said likely 8-10 hours at $192 an hour (woof). I messaged Evergreen Offroad but haven’t heard back from them yet.

shwazz714 · Mar 20, 2026

Update - I dropped down to 190 MTE on my way back from the beach and then looked down a few mins later and was back at a full tank w/ 280 MTE.

Still on first full tank so I think the barometer is - if it’s actually less than ~190 MTE that means there is nothing left in the aux tank.

will continue to provide updates

agjake01 · Mar 20, 2026

shwazz714 said:
Update - I dropped down to 190 MTE on my way back from the beach and then looked down a few mins later and was back at a full tank w/ 280 MTE.

Still on first full tank so I think the barometer is - if it’s actually less than ~190 MTE that means there is nothing left in the aux tank.

will continue to provide updates

Interesting, thanks for sharing!

shwazz714 · Mar 20, 2026

Been a bit weird. Had the first move from 190 to 280 then later I wasn’t really paying attention and it dropped down to like 195 and then jumped up again to 280 maybe 5 miles later and now at 275. Will see how it goes rest of the way and provide updates.

EOD Guy · Mar 20, 2026

From my understanding the 12 gal aux tank has a siphon valve/pump that transfers fuel to the main tank. I 'm curious as how that's going to affect the fuel gauge numbers.

agjake01 · Mar 20, 2026

Any idea if the 12Gal FK will work with the factory FE skids?

shwazz714 · Mar 20, 2026

agjake01 said:
Any idea if the 12Gal FK will work with the factory FE skids?

I have FE skid plates and it fit no issues.

If I was more of a car guy and had access to a lift I’d get you all some pics but alas….

agjake01 · Mar 20, 2026

shwazz714 said:
I have FE skid plates and it fit no issues.

If I was more of a car guy and had access to a lift I’d get you all some pics but alas….

No worries, really appreciate all your feedback regardless! I just need to find a shop that can do it somewhat affordably, or wait for EODs write up and start the install with some liquid courage. You’ve got me almost ready to pull the trigger.

EOD Guy · Mar 21, 2026

I was hoping the tank would arrive by the end of Mar before the weather gets too hot, but alas I don't think that's going to happen.

(edit) mine arrived today 3/25/26. Another thread containing some information (a lot is the same)

29gal Main Fuel Tank Install

Yes, it looks like it includes exhaust modifications with the kit. Thats a major scope step. Waiting for mine as we speak, they had the New Years holiday in Feb for at least half a month

www.landcruiserforum.com

Swerdna · Mar 25, 2026

@EOD Guy & @shwazz714 How did you guys pay FK? Seems a bit sketchy since their card system is not ready.

I’m looking at Alipay/western union/ and a bank account that not used for much but it have my hair up as I don’t imagine there is any way to claw this back.

EOD Guy · Mar 25, 2026

Swerdna said:
@EOD Guy & @shwazz714 How did you guys pay FK? Seems a bit sketchy since their card system is not ready.

I’m looking at Alipay/western union/ and a bank account that not used for much but it have my hair up as I don’t imagine there is any way to claw this back.

I was extremely skeptical as well. I hadn't had good luck with a few other direct from China transactions. However in this case the only real inconvenience was the shipment time.

They took PayPal for my payment. It was convoluted…….. on the FK web site, I opened up a chat, explained I wanted the 12 gal aux tank vs the 16, they then sent me a link to the Alibaba site for the 12 gal aux tank, where I also started a chat, I placed the order, paid on the link, confirmed the order, paid with PP IF I remember the details correctly. I posted some where on the exact process (when it was still fresh in my mind) I received my tank today, with no problems with payment or customs, but had a slight issue with delivery coordination, but that's because when the carrier called, I didn't answer (I don't answer if the number isn't already in my phone). Alibaba had sent me an email (I provided my email during the ordering/chat process with Alibaba) I went back to the Alibaba site re-opened the chat and asked about delivery and explained, I had called the carrier, but the carrier could not locate my shipment with the order number nor my phone number. The chat person gave me a MK-#####. I called the carrier back and gave them the "MK" number and my order popped right up.