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I have added this to all my family vehicles and with great success when tested before and after on my dyno.
AMSOIL P.i. Performance Improver Gasoline Additive

Just added this addtive today to my 189000 mile 2006 Frontier SE and going to be changing the plugs on it this week when I get a chance from doing stuff at the shop. I have been seeing a little hesitation at idle in the mornings and even see the fuel corrections fluctuate a little on the uprev datalogs.

Will report back when i get the truck back on the my dyno.
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