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It is said if you want the full HP rating that you need to run Super (91), but many have said they can't tell a difference with Regular (87) One guy even did dyno testing and says there was no difference for him in an older post here.

For the V6s there are different rear end gear ratios so depending on the model that can even make a difference on "real world gas mileage". I have a Nismo and I average about 16.5mpg, mixed driving, lifted on 33" MTs, which btw has the lowest gearing. Z
 
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