Having bought a new (to me) 2010 Prius, I went through 2 tank fulls of gas.
On the second tank, I added some STP Super Concentrated Fuel cleaner, in the black bottle.
I would swear it had more MPG with that second tank. Averaged about 52 mpg, with use of Arco gas. (The first tank with no fuel treatment was also Arco gas)
Now I just did a 3rd fill up (Chevron gas this time) and no STP treatment....and now the MPG is back down to 49 mpg average.
Did STP do more than just clean the injectors, or make a difference at all? Should I add another bottle to get the job done even better?
This is the first time I've used this brand in a Prius.
GL
On the second tank, I added some STP Super Concentrated Fuel cleaner, in the black bottle.
I would swear it had more MPG with that second tank. Averaged about 52 mpg, with use of Arco gas. (The first tank with no fuel treatment was also Arco gas)
Now I just did a 3rd fill up (Chevron gas this time) and no STP treatment....and now the MPG is back down to 49 mpg average.
Did STP do more than just clean the injectors, or make a difference at all? Should I add another bottle to get the job done even better?
This is the first time I've used this brand in a Prius.
GL