I reckon that reducing the fuel tank size would increase your jump range slightly. (Less excess fuel to carry to the next star.) This was something to bear in mind in the early days of ED. I have been trapped in a volume of space that I could not get out of until I burned off most of the fuel in my tank.I tend to refuel on every star as I pass it. Would smaller fuel tanks significantly reduce the required fuel for each jump? I'd happily go with smaller tanks if it allowed an equilibrium point.