Tune up?
 

Hey ppl new to the forum here..

i have a 97 ltd v6 4x4 runner with 125,600 miles on and never had any problems with it..
till yesterday..i would normally drive about 60-70 miles or so to commute one way and i'd loose about quarter of a tank of fuel.. but this time with the same drving distance i lost half a tank.. anyone know what might' of caused this.. for sure i will need to change plugs since i haven't done that since 40k miles when i first bought it..

so far timing belt, starter water pump i think.. has been changed.. and i just dropped in a new k&n air filter and four new bridgestones tires..

i just need to know what other stuff should i look into for a tune up.. i hear fuel filter???