my '04, sr5, 4-cyl. taco seems to be getting poor gas mileage.
i have 20k on the engine, drive 50/50 street and freeway and just put in iridium spark plugs. when i can afford it i use chevron gas, when i can't i use arco with a separate additive.
is there any way to get better mileage or is that "wishful thinking"?