STP and gas mileage


#1

I have a 1990 Nissan Maxima with 136000 miles. Will putting STP or something like it in the tank with a fill-up help it run better or help get better gas mileage? As you can tell I’m pretty much of a dunce with cars.


#2

If you have symptoms of clogged fuel injectors (hesitation, rough idle), adding a quality fuel system cleaning product like Seafoam or Chevron’s Techron will help those symptoms and may help to increase your gas mileage a bit. STP fuel system cleaner is essentially useless.


#3

I would agree with the above. Also, under no circumstances, put the sticky STP engine treatment in you crankcase. That’s for very old, worn out engines that use oil to get a few moreextar miles before they bite the dust.


#4

Do as these folks say. There are additives to clean your car, which might get it running better and thereby return mileage to normal, but there are not miracles in a bottle that will significantly increase the mileage of a good-running car.