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As far as I know all modern Broncos have 34 gallon tanks. They will run out at about 29 though. The rest is unusable. I have a 40 gal aftermarket tank with skidplate. But I cant remember where I got it. I had it installed on my 88' Bronco and moved it to my 90'. I also have a 50 gallon tank with quick disconnects. Check out my gallery if your intrested.
My Signature is the Bronco I'm getting 14.2 mpg. I'm still shooting for 15.