another plan i have been working out the details for is adding an 90's F150 rear fuel tank to the 4runner. the runner has a 19+/- gallon tank, highway i got 20mpg, around town i get 13-14mpg, not a good range when off-road. once i change the gears my mpg will get a little better but that extra range will be nice on trips and traveling anywhere in wyoming where everythings 100 miles away.

So the F150 tank is a 18 gallon tank, you might be thinking wait thats one gallon less. well the F150 tank will fit in between the frame rails where the spare tire currently fits. cut out the spare tire bracket, fab up strap mounting for the tank, and it fits between the rails and doesnt stick below the frame any or only about an inch (different mounts ive seen people use has the distance different). some guys have used the F150 fuel pump but the guage reads backwards, im just looking at putting a transfer pump in and pump from the ford tank to the toyota tank. i found a transfer pump for under $50 that has a 140GPH flow, my math has it at about 8-9 minutes to completely empty the ford tank.

effectively doubling my range.