Those cool folks with the extended gas tank!

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That’s a good reason. If you’re out wheeling it takes the place of cans. I’ll admit the cans are WAY cheaper. I could also add either a 24 or 42 gallon auxiliary tank from LRA. I really just wanted range driving down the highway or wheeling. That’s me. Your needs may vary. My plan is to turbo my 2nd 80 so more 93 octane will be a good thing.

I’ll give a shout-out to @wardharris and CB for importing the tank. Everything you need is in the box. You do have to drill a hole through the floor for one of the straps so seal that. You do have to extend the float, etc. Parts are in there. Instructions include all the steps.
 
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Its mainly for emergencies. Like down here in FL we get hurricanes and everything runs out quickly. Some people go travel into small towns and dont trust gas stations. I think it's more to have peace of mind.

I get the emergency thing (I live in Orlando) but adding a few extra liters is hardly going make that much difference in a real fuel shortage. I have a couple of 5 gallon tanks on the back of my truck and a further 5 in my garage if the need arises. I still can't see the need to bolt a costly sub tank to my rig though...
 
I have the 42 in my turbo 80 and yes to all of the cons. The one con not mentioned is when it goes on reserve you have 10 gals where before it was 5. So you need to note when the light goes on having ~125 miles of range remaining.
 
Traveling in areas where fuel is scarce is reason enough. Deserts and certain mountain ranges can have limited supplies. I was in Sequoia NP 3 weeks ago when one of the 2 pump stations went down. The other station was 30 miles away and I had the LRA tank on my mind the entire time. 24 aux is probably the last "big" mod i will do to my truck.
 
Man, on the freeway my rig will do roughly 4 hours at 60MPH between tank refills. Strangely my bladder is roughly the same before needing emptying. It's hard to see the value of an extended range tank (at least at my age). Not sure I see the real world need for this mod...

Remember, not everyone only drives their vehicles on the pavement in populated areas. More fuel than stock is a must if you go out to the middle of nowhere. When I go out camping in the Oregon outback, there are no gas stations (or people) anywhere remotely close. It's either a larger tank, subtank, or cans. Maybe in the east you can get away with the stock tank, but out west, there are lots of places where more gas is a requirement.
 
More fuel is always better for longer and farther travelling.

As for the emergency aspect, it also helps. Very much so. Regional fuel shortages here are common, so extended range is a very serious safety issue. In a widespread shortage during a hurricane in South Florida, for example, it will also help. Remember you can have both the long range tanks and fuel cans, they're not mutually exclusive. Again, in these situations, more is better.

If you get two tanks, you can plumb a bypass valve in the transfer line to drain using the fuel pump of the aux tank to fill up jerry cans or tanks for generators and outboards. This can easily be done using a marine 3 way fuel valve, it is very useful. Draining the fuel tanks via the drain plug underneath is impossibly messy.
 
I put one under mine a while ago, haven't fueled it up or used it yet. Not sure of capacity.

I needed clearance for the hot dog air tank near the rear bumper so it starts about 6" away from the rear bumper and I lose some capacity because of that, but I run a diesel so... meh

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At some point in the near future I plan to put a 30 liter water tank in the rear passenger quarter panel, I'm retaining the third row so maximizing storage is big. Eliminating space for water, fuel etc is a big part of design consideration.
 
Kind of a false statement; you're implying sub tanks can still found lol. You may have better luck finding a unicorn.
Absolutely false there’s a company in Raleigh North Carolina that sells them several different sizes actually.

 
Absolutely false there’s a company in Raleigh North Carolina that sells them several different sizes actually.

Yeah, but you took a smart as$ remark seriously and then you replied out of context to the original post. Do you work for the media? The OP was referring to a FACTORY sub tank, not LRA or other after market sub tanks.
 
Absolutely false there’s a company in Raleigh North Carolina that sells them several different sizes actually.

 
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