How big is my gas tank?!

A

 

If you have the SR5 Upgrade which takes away your bench seat and gives you the center shifter and console, then have the bigger 38 gallon tank. If you have the bench seat with your shifter behind the steering wheel, then your tank is the smaller one.

 

They only make two tanks
26 gallons the one I have but not for long because it sucks to only be able to go 286 miles for me to be at total empty.
38 gallon tank which you should have.
Your fuel tank computer doesn’t calculate the reserve you have left.

If you really just have to know carry a 5 gallon Jerry can and run your truck completely out of fuel. That will give you an actual drive to empty test. Just don’t run out on a busy road or highway, which can be very dangerous

 

Toyota Canada lists the CrewMax for us Metric users as:

Fuel Capacity litres (gal.)
144 (38)

I filled ours today from almost empty, less than 10km left and put it 120 litres (32 gal) That means the reserve is approx 25 litres (6 gal).

Seems to fall in line with the other observation for you gallon guys.

 

Ah, the hell with all that I'm just gonna install an L tank and fuel hose in the bed and call it good. Not necessarily a 100 gal but at least a 50. Had one in my f250 years ago, made road trips alot less hassle at 11 mpg my tundra is gett about 300 per fill up so the extra 400 lbs isn't going to make much difference to me in the long run.

 

The most I've been able to fill up to is 27, but i really have never let it get close to or below the E line, i did get the upgraded tank according to the dealership.