I had a 1999 path, 3.5L engine and could get around 295 miles on a tank, just with a cold-air intake and cat-back exhaust, and I was doing a lot of highway and had
P265/70R15 tires, with 32psi, my path had 245XXXkm (152XXXmiles), everything else was stock, actually never changed the fuel pump on mine,neither the injectors, I cleaned the gas filter once, my path was a tank, but the belt was starting to go and the aternator also.