oh no, it's not required for anything. i can run it without any treatment no problem, i just always been in the habit of doing that...plus the little label that says use on every tank 
i don't even know if it really lives up to the claims of saving gas and improving gas mileage because i have never really compared without it.
it is supposed to keep your fuel system clean along with some other various stuff, and i don't really mind paying an extra two dollars in addition to the already high price of gas, since it can't hurt.
the ones that i really do try to avoid are the ones that cost like 15 dollars and claim to improve performance by like 20 horsepower and i just don't buy those b.s. claims...but stp is a pretty well known and reliable brand that has been out there for years and years.
i don't even know if it really lives up to the claims of saving gas and improving gas mileage because i have never really compared without it.
it is supposed to keep your fuel system clean along with some other various stuff, and i don't really mind paying an extra two dollars in addition to the already high price of gas, since it can't hurt.
the ones that i really do try to avoid are the ones that cost like 15 dollars and claim to improve performance by like 20 horsepower and i just don't buy those b.s. claims...but stp is a pretty well known and reliable brand that has been out there for years and years.
