Royal purple oil, does it really improve gas mileage by 5%?

Question:
guy started talking to me abuot this stuff said it increases horsepower and mpg as well as torque. does this stuff really work that well. ive never heard of it before and i want to try it out for the mpg but i need to know if it really works. any storys are appreciated. thanks

Answers:

Is it possible to put power steering on a citroen saxo 1.0i, t plate?

I do remember a few years ago one of the car magazines dyno'ed a corvette and it did add 9 horsepower. It is good quality oil yet it is expensive. I'm not really sure if it would be worth it unless you had a highly modified vehicle.
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