Yup my 95 ext cab long bed has 34 gallon tank as stated in the OEM manual.
I normally fill mine at 1/2 tank, normal avg milage is around 350 & the avg fill is 18 gal.
PS the pump will kick off sometimes as low as 14 gal from foam pending how fast station pump runs on the low speed, then if I have time & fudge around with it some normally it ends up full at 18 gal.